How can I replace every global instance of “x[2]” with “x_2”












7















This is a slightly different question to what I've seen before, where I can use something like newcommand{ga}{gamma} to make shortcuts of things using .



I have a series of LONG equations with stuff like x[2] or a[3] in them. I want to be able to always replace any instance of them with something else, like a command that takes a string and replaces it like something similar to



newcommand{x[2]}{x_2}



and



newcommand{a[2]}{beta}



Ideally, this would take account of the number inside, but I could easily just do it for all instances that arise. Any guidance would be great (my document class is Report)










share|improve this question























  • Sort of sounds like translating math equations from one syntax to another, which reminded me of my very strange answer here: tex.stackexchange.com/questions/332012/…. Not that it will help you in the present case, without significant rework.

    – Steven B. Segletes
    11 hours ago











  • Do you absolutely need to convert as you typeset, or can you convert your source? If the latter, do you think it would be possible to unambiguously define all the situations in which this syntax would occur?

    – Chris H
    11 hours ago











  • @ChrisH that's exactly what I'm hoping for. I'm copying some parts of equations from Mathematica, and is written in terms of coefficients like x[2] for example, where I avoided subscripts in my code. I now want to save myself effort and simply define x[2] = x_2 in Latex, since it'll only ever occur within an equation.

    – Brad
    11 hours ago











  • @StevenB.Segletes thank you for your post - Remarkably strange answer for that question, but I'll bear it in mind! I'm sure there must be a simpler way.

    – Brad
    11 hours ago






  • 2





    My editor of choice supports regex find/replace so I'd simply find x[([0-9])] and replace with x_$1 (on a copy of course)

    – Chris H
    11 hours ago
















7















This is a slightly different question to what I've seen before, where I can use something like newcommand{ga}{gamma} to make shortcuts of things using .



I have a series of LONG equations with stuff like x[2] or a[3] in them. I want to be able to always replace any instance of them with something else, like a command that takes a string and replaces it like something similar to



newcommand{x[2]}{x_2}



and



newcommand{a[2]}{beta}



Ideally, this would take account of the number inside, but I could easily just do it for all instances that arise. Any guidance would be great (my document class is Report)










share|improve this question























  • Sort of sounds like translating math equations from one syntax to another, which reminded me of my very strange answer here: tex.stackexchange.com/questions/332012/…. Not that it will help you in the present case, without significant rework.

    – Steven B. Segletes
    11 hours ago











  • Do you absolutely need to convert as you typeset, or can you convert your source? If the latter, do you think it would be possible to unambiguously define all the situations in which this syntax would occur?

    – Chris H
    11 hours ago











  • @ChrisH that's exactly what I'm hoping for. I'm copying some parts of equations from Mathematica, and is written in terms of coefficients like x[2] for example, where I avoided subscripts in my code. I now want to save myself effort and simply define x[2] = x_2 in Latex, since it'll only ever occur within an equation.

    – Brad
    11 hours ago











  • @StevenB.Segletes thank you for your post - Remarkably strange answer for that question, but I'll bear it in mind! I'm sure there must be a simpler way.

    – Brad
    11 hours ago






  • 2





    My editor of choice supports regex find/replace so I'd simply find x[([0-9])] and replace with x_$1 (on a copy of course)

    – Chris H
    11 hours ago














7












7








7








This is a slightly different question to what I've seen before, where I can use something like newcommand{ga}{gamma} to make shortcuts of things using .



I have a series of LONG equations with stuff like x[2] or a[3] in them. I want to be able to always replace any instance of them with something else, like a command that takes a string and replaces it like something similar to



newcommand{x[2]}{x_2}



and



newcommand{a[2]}{beta}



Ideally, this would take account of the number inside, but I could easily just do it for all instances that arise. Any guidance would be great (my document class is Report)










share|improve this question














This is a slightly different question to what I've seen before, where I can use something like newcommand{ga}{gamma} to make shortcuts of things using .



I have a series of LONG equations with stuff like x[2] or a[3] in them. I want to be able to always replace any instance of them with something else, like a command that takes a string and replaces it like something similar to



newcommand{x[2]}{x_2}



and



newcommand{a[2]}{beta}



Ideally, this would take account of the number inside, but I could easily just do it for all instances that arise. Any guidance would be great (my document class is Report)







macros shorthands






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 11 hours ago









BradBrad

432




432













  • Sort of sounds like translating math equations from one syntax to another, which reminded me of my very strange answer here: tex.stackexchange.com/questions/332012/…. Not that it will help you in the present case, without significant rework.

    – Steven B. Segletes
    11 hours ago











  • Do you absolutely need to convert as you typeset, or can you convert your source? If the latter, do you think it would be possible to unambiguously define all the situations in which this syntax would occur?

    – Chris H
    11 hours ago











  • @ChrisH that's exactly what I'm hoping for. I'm copying some parts of equations from Mathematica, and is written in terms of coefficients like x[2] for example, where I avoided subscripts in my code. I now want to save myself effort and simply define x[2] = x_2 in Latex, since it'll only ever occur within an equation.

    – Brad
    11 hours ago











  • @StevenB.Segletes thank you for your post - Remarkably strange answer for that question, but I'll bear it in mind! I'm sure there must be a simpler way.

    – Brad
    11 hours ago






  • 2





    My editor of choice supports regex find/replace so I'd simply find x[([0-9])] and replace with x_$1 (on a copy of course)

    – Chris H
    11 hours ago



















  • Sort of sounds like translating math equations from one syntax to another, which reminded me of my very strange answer here: tex.stackexchange.com/questions/332012/…. Not that it will help you in the present case, without significant rework.

    – Steven B. Segletes
    11 hours ago











  • Do you absolutely need to convert as you typeset, or can you convert your source? If the latter, do you think it would be possible to unambiguously define all the situations in which this syntax would occur?

    – Chris H
    11 hours ago











  • @ChrisH that's exactly what I'm hoping for. I'm copying some parts of equations from Mathematica, and is written in terms of coefficients like x[2] for example, where I avoided subscripts in my code. I now want to save myself effort and simply define x[2] = x_2 in Latex, since it'll only ever occur within an equation.

    – Brad
    11 hours ago











  • @StevenB.Segletes thank you for your post - Remarkably strange answer for that question, but I'll bear it in mind! I'm sure there must be a simpler way.

    – Brad
    11 hours ago






  • 2





    My editor of choice supports regex find/replace so I'd simply find x[([0-9])] and replace with x_$1 (on a copy of course)

    – Chris H
    11 hours ago

















Sort of sounds like translating math equations from one syntax to another, which reminded me of my very strange answer here: tex.stackexchange.com/questions/332012/…. Not that it will help you in the present case, without significant rework.

– Steven B. Segletes
11 hours ago





Sort of sounds like translating math equations from one syntax to another, which reminded me of my very strange answer here: tex.stackexchange.com/questions/332012/…. Not that it will help you in the present case, without significant rework.

– Steven B. Segletes
11 hours ago













Do you absolutely need to convert as you typeset, or can you convert your source? If the latter, do you think it would be possible to unambiguously define all the situations in which this syntax would occur?

– Chris H
11 hours ago





Do you absolutely need to convert as you typeset, or can you convert your source? If the latter, do you think it would be possible to unambiguously define all the situations in which this syntax would occur?

– Chris H
11 hours ago













@ChrisH that's exactly what I'm hoping for. I'm copying some parts of equations from Mathematica, and is written in terms of coefficients like x[2] for example, where I avoided subscripts in my code. I now want to save myself effort and simply define x[2] = x_2 in Latex, since it'll only ever occur within an equation.

– Brad
11 hours ago





@ChrisH that's exactly what I'm hoping for. I'm copying some parts of equations from Mathematica, and is written in terms of coefficients like x[2] for example, where I avoided subscripts in my code. I now want to save myself effort and simply define x[2] = x_2 in Latex, since it'll only ever occur within an equation.

– Brad
11 hours ago













@StevenB.Segletes thank you for your post - Remarkably strange answer for that question, but I'll bear it in mind! I'm sure there must be a simpler way.

– Brad
11 hours ago





@StevenB.Segletes thank you for your post - Remarkably strange answer for that question, but I'll bear it in mind! I'm sure there must be a simpler way.

– Brad
11 hours ago




2




2





My editor of choice supports regex find/replace so I'd simply find x[([0-9])] and replace with x_$1 (on a copy of course)

– Chris H
11 hours ago





My editor of choice supports regex find/replace so I'd simply find x[([0-9])] and replace with x_$1 (on a copy of course)

– Chris H
11 hours ago










5 Answers
5






active

oldest

votes


















3














An extensible set of replacements:



documentclass{article}
usepackage{amsmath}
usepackage{xparse}

ExplSyntaxOn
NewDocumentCommand{trans}{m}
{
tl_set:Nn l__brad_trans_tl { #1 }
regex_replace_all:nnN { [(.*?)] } { c{sb}cB{1cE} } l__brad_trans_tl
regex_replace_all:nnN { a } { c{alpha} } l__brad_trans_tl
% other replacements
% ...
% deliver the new token list
l__brad_trans_tl
}
ExplSyntaxOff

begin{document}

$trans{x[1]+x[2]^2+a+a[3]}$

end{document}


enter image description here






share|improve this answer



















  • 1





    Same comment as I made on David's answer. Yes, my l3regex is sometimes useful, but here the right solution by far is to do the replacements in Mathematica, not TeX.

    – Bruno Le Floch
    7 hours ago



















5














I really can not recommend doing this, but as you ask...



enter image description here



documentclass{article}

begin{document}


mathcode`[="8000
mathcode`]="8000
{
catcode`[=active gdef[{_bgroup}
catcode`]=active gdef]{egroup}
}

hmmm
[
a[1]+a[2]+b[c+d[3]] + x
]

end{document}





share|improve this answer
























  • Thank you for your answer - this is not quite what I'm after. But since this is not quite a conventional method, perhaps I am better simply going through and replacing things manually... I am moreso hoping to simply find a particular string and replace it with something else.

    – Brad
    11 hours ago











  • @Brad that really isn't how tex works:-) (unless you are using luatex)

    – David Carlisle
    11 hours ago











  • No worries at all! I have no problem sorting through everything, but I was hoping to save myself a bit of eyesight. Thank you for your help regardless!

    – Brad
    11 hours ago











  • @DavidCarlisle Come on, don't advocate crazy solutions to problems that can be trivially solved on the other side of the conversion. Brad should simply do the replacement in Mathematica.

    – Bruno Le Floch
    7 hours ago











  • @BrunoLeFloch I'd already said that in comments under the question, or just use perl or any other sane mechanism, but it's easy for you to see that this is beyond what's reasonable to do in tex as you know more than most on where tex's limits are, but I think it is still useful as a general rule to sketch how far you can get (and in particular what you can not reasonably do) in tex for this kind of question.

    – David Carlisle
    7 hours ago



















4














Inasmuch as I love doing crazy things in TeX, do the replacements in Mathematica! This will save you a huge amount of pain. For instance,



expr = (a[1] + a[2])/Sqrt[a[3]]
expr /. {a[1] -> [Alpha], a[2] -> [Beta], a[3] -> [Gamma]} // TeXForm


gives frac{alpha +beta }{sqrt{gamma }} with no need to tweak the output.






share|improve this answer































    3














    Along the vein of my cited Translate in-line equations to TeX code (Any Package?), but a much simpler parsing request, I provide translate.



    No catcode changes required. It will retain surrounding math style, etc.



    documentclass{article}
    usepackage{listofitems}
    newtokseqtoks
    newcommandaddtoeqtoks[1]{expandaftereqtoksexpandafter{theeqtoks#1}}
    newcommandtranslate[1]{%
    setsepchar{[||]}%
    readlistmyeqn{#1}%
    eqtoks{}%
    foreachitemxinmyeqn{%
    ifnumxcnt=1else%
    if[myeqnsep[numexprxcnt-1]addtoeqtoks{_bgroup}fi%
    if]myeqnsep[numexprxcnt-1]addtoeqtoks{egroup}fi%
    fi%
    expandafteraddtoeqtoksexpandafter{x}%
    }%
    theeqtoks%
    }
    begin{document}
    [
    translate{a[1]+a[2]+b[c+d[3]] + x}
    ]
    end{document}


    enter image description here






    share|improve this answer































      1














      Here's a solution. The command addreplacementrule{text-to-replace}{replacement-text} specifies replacements to make. Then the command replace{some math} does the replacements.



      This would probably be better done with the l3regex package or really find and replace as many other people mentioned.



      documentclass{article}
      makeatletter
      newtoksri@activechars
      defaddreplacementrule#1#2{addreplacementrule@#1@nil{#2}}
      defaddreplacementrule@#1#2@nil#3{%
      ri@activecharsexpandafter{theri@activechars\#1}%
      ri@maketransitions#2@nil{#1}{#3}%
      }

      defreplace#1{%
      begingroup
      def\##1{%
      bgrouplccode`~=`##1lowercase{egroup
      def~{ri@continue{##1}}%
      }%
      catcode`##1=active
      }%
      theri@activechars
      scantokens{#1}%
      endgroup
      }

      defri@maketransitions#1#2@nil#3#4{%
      deftemp{#2}%
      ifxtempempty
      expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{#4}%
      letnextrelax
      else
      expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{ri@continue{#3#1}}%
      defnext{ri@maketransitions#2@nil{#3#1}{#4}}%
      fi
      next
      }


      defri@continue#1#2{%
      @ifundefined{ri@lookup@detokenize{#1#2}}{%
      detokenize{#1}#2%
      }{%
      csname ri@lookup@detokenize{#1#2}endcsname
      }%
      }


      begin{document}
      addreplacementrule{x[2]}{x_2}
      addreplacementrule{x[3]}{x^2}

      $x+1+x[2]+x[3]+x[1]$

      replace{$x+1+x[2]+x[3]+x[1]$}
      end{document}


      enter image description here






      share|improve this answer

























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        5 Answers
        5






        active

        oldest

        votes








        5 Answers
        5






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes









        3














        An extensible set of replacements:



        documentclass{article}
        usepackage{amsmath}
        usepackage{xparse}

        ExplSyntaxOn
        NewDocumentCommand{trans}{m}
        {
        tl_set:Nn l__brad_trans_tl { #1 }
        regex_replace_all:nnN { [(.*?)] } { c{sb}cB{1cE} } l__brad_trans_tl
        regex_replace_all:nnN { a } { c{alpha} } l__brad_trans_tl
        % other replacements
        % ...
        % deliver the new token list
        l__brad_trans_tl
        }
        ExplSyntaxOff

        begin{document}

        $trans{x[1]+x[2]^2+a+a[3]}$

        end{document}


        enter image description here






        share|improve this answer



















        • 1





          Same comment as I made on David's answer. Yes, my l3regex is sometimes useful, but here the right solution by far is to do the replacements in Mathematica, not TeX.

          – Bruno Le Floch
          7 hours ago
















        3














        An extensible set of replacements:



        documentclass{article}
        usepackage{amsmath}
        usepackage{xparse}

        ExplSyntaxOn
        NewDocumentCommand{trans}{m}
        {
        tl_set:Nn l__brad_trans_tl { #1 }
        regex_replace_all:nnN { [(.*?)] } { c{sb}cB{1cE} } l__brad_trans_tl
        regex_replace_all:nnN { a } { c{alpha} } l__brad_trans_tl
        % other replacements
        % ...
        % deliver the new token list
        l__brad_trans_tl
        }
        ExplSyntaxOff

        begin{document}

        $trans{x[1]+x[2]^2+a+a[3]}$

        end{document}


        enter image description here






        share|improve this answer



















        • 1





          Same comment as I made on David's answer. Yes, my l3regex is sometimes useful, but here the right solution by far is to do the replacements in Mathematica, not TeX.

          – Bruno Le Floch
          7 hours ago














        3












        3








        3







        An extensible set of replacements:



        documentclass{article}
        usepackage{amsmath}
        usepackage{xparse}

        ExplSyntaxOn
        NewDocumentCommand{trans}{m}
        {
        tl_set:Nn l__brad_trans_tl { #1 }
        regex_replace_all:nnN { [(.*?)] } { c{sb}cB{1cE} } l__brad_trans_tl
        regex_replace_all:nnN { a } { c{alpha} } l__brad_trans_tl
        % other replacements
        % ...
        % deliver the new token list
        l__brad_trans_tl
        }
        ExplSyntaxOff

        begin{document}

        $trans{x[1]+x[2]^2+a+a[3]}$

        end{document}


        enter image description here






        share|improve this answer













        An extensible set of replacements:



        documentclass{article}
        usepackage{amsmath}
        usepackage{xparse}

        ExplSyntaxOn
        NewDocumentCommand{trans}{m}
        {
        tl_set:Nn l__brad_trans_tl { #1 }
        regex_replace_all:nnN { [(.*?)] } { c{sb}cB{1cE} } l__brad_trans_tl
        regex_replace_all:nnN { a } { c{alpha} } l__brad_trans_tl
        % other replacements
        % ...
        % deliver the new token list
        l__brad_trans_tl
        }
        ExplSyntaxOff

        begin{document}

        $trans{x[1]+x[2]^2+a+a[3]}$

        end{document}


        enter image description here







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 8 hours ago









        egregegreg

        729k8819263237




        729k8819263237








        • 1





          Same comment as I made on David's answer. Yes, my l3regex is sometimes useful, but here the right solution by far is to do the replacements in Mathematica, not TeX.

          – Bruno Le Floch
          7 hours ago














        • 1





          Same comment as I made on David's answer. Yes, my l3regex is sometimes useful, but here the right solution by far is to do the replacements in Mathematica, not TeX.

          – Bruno Le Floch
          7 hours ago








        1




        1





        Same comment as I made on David's answer. Yes, my l3regex is sometimes useful, but here the right solution by far is to do the replacements in Mathematica, not TeX.

        – Bruno Le Floch
        7 hours ago





        Same comment as I made on David's answer. Yes, my l3regex is sometimes useful, but here the right solution by far is to do the replacements in Mathematica, not TeX.

        – Bruno Le Floch
        7 hours ago











        5














        I really can not recommend doing this, but as you ask...



        enter image description here



        documentclass{article}

        begin{document}


        mathcode`[="8000
        mathcode`]="8000
        {
        catcode`[=active gdef[{_bgroup}
        catcode`]=active gdef]{egroup}
        }

        hmmm
        [
        a[1]+a[2]+b[c+d[3]] + x
        ]

        end{document}





        share|improve this answer
























        • Thank you for your answer - this is not quite what I'm after. But since this is not quite a conventional method, perhaps I am better simply going through and replacing things manually... I am moreso hoping to simply find a particular string and replace it with something else.

          – Brad
          11 hours ago











        • @Brad that really isn't how tex works:-) (unless you are using luatex)

          – David Carlisle
          11 hours ago











        • No worries at all! I have no problem sorting through everything, but I was hoping to save myself a bit of eyesight. Thank you for your help regardless!

          – Brad
          11 hours ago











        • @DavidCarlisle Come on, don't advocate crazy solutions to problems that can be trivially solved on the other side of the conversion. Brad should simply do the replacement in Mathematica.

          – Bruno Le Floch
          7 hours ago











        • @BrunoLeFloch I'd already said that in comments under the question, or just use perl or any other sane mechanism, but it's easy for you to see that this is beyond what's reasonable to do in tex as you know more than most on where tex's limits are, but I think it is still useful as a general rule to sketch how far you can get (and in particular what you can not reasonably do) in tex for this kind of question.

          – David Carlisle
          7 hours ago
















        5














        I really can not recommend doing this, but as you ask...



        enter image description here



        documentclass{article}

        begin{document}


        mathcode`[="8000
        mathcode`]="8000
        {
        catcode`[=active gdef[{_bgroup}
        catcode`]=active gdef]{egroup}
        }

        hmmm
        [
        a[1]+a[2]+b[c+d[3]] + x
        ]

        end{document}





        share|improve this answer
























        • Thank you for your answer - this is not quite what I'm after. But since this is not quite a conventional method, perhaps I am better simply going through and replacing things manually... I am moreso hoping to simply find a particular string and replace it with something else.

          – Brad
          11 hours ago











        • @Brad that really isn't how tex works:-) (unless you are using luatex)

          – David Carlisle
          11 hours ago











        • No worries at all! I have no problem sorting through everything, but I was hoping to save myself a bit of eyesight. Thank you for your help regardless!

          – Brad
          11 hours ago











        • @DavidCarlisle Come on, don't advocate crazy solutions to problems that can be trivially solved on the other side of the conversion. Brad should simply do the replacement in Mathematica.

          – Bruno Le Floch
          7 hours ago











        • @BrunoLeFloch I'd already said that in comments under the question, or just use perl or any other sane mechanism, but it's easy for you to see that this is beyond what's reasonable to do in tex as you know more than most on where tex's limits are, but I think it is still useful as a general rule to sketch how far you can get (and in particular what you can not reasonably do) in tex for this kind of question.

          – David Carlisle
          7 hours ago














        5












        5








        5







        I really can not recommend doing this, but as you ask...



        enter image description here



        documentclass{article}

        begin{document}


        mathcode`[="8000
        mathcode`]="8000
        {
        catcode`[=active gdef[{_bgroup}
        catcode`]=active gdef]{egroup}
        }

        hmmm
        [
        a[1]+a[2]+b[c+d[3]] + x
        ]

        end{document}





        share|improve this answer













        I really can not recommend doing this, but as you ask...



        enter image description here



        documentclass{article}

        begin{document}


        mathcode`[="8000
        mathcode`]="8000
        {
        catcode`[=active gdef[{_bgroup}
        catcode`]=active gdef]{egroup}
        }

        hmmm
        [
        a[1]+a[2]+b[c+d[3]] + x
        ]

        end{document}






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 11 hours ago









        David CarlisleDavid Carlisle

        496k4111421889




        496k4111421889













        • Thank you for your answer - this is not quite what I'm after. But since this is not quite a conventional method, perhaps I am better simply going through and replacing things manually... I am moreso hoping to simply find a particular string and replace it with something else.

          – Brad
          11 hours ago











        • @Brad that really isn't how tex works:-) (unless you are using luatex)

          – David Carlisle
          11 hours ago











        • No worries at all! I have no problem sorting through everything, but I was hoping to save myself a bit of eyesight. Thank you for your help regardless!

          – Brad
          11 hours ago











        • @DavidCarlisle Come on, don't advocate crazy solutions to problems that can be trivially solved on the other side of the conversion. Brad should simply do the replacement in Mathematica.

          – Bruno Le Floch
          7 hours ago











        • @BrunoLeFloch I'd already said that in comments under the question, or just use perl or any other sane mechanism, but it's easy for you to see that this is beyond what's reasonable to do in tex as you know more than most on where tex's limits are, but I think it is still useful as a general rule to sketch how far you can get (and in particular what you can not reasonably do) in tex for this kind of question.

          – David Carlisle
          7 hours ago



















        • Thank you for your answer - this is not quite what I'm after. But since this is not quite a conventional method, perhaps I am better simply going through and replacing things manually... I am moreso hoping to simply find a particular string and replace it with something else.

          – Brad
          11 hours ago











        • @Brad that really isn't how tex works:-) (unless you are using luatex)

          – David Carlisle
          11 hours ago











        • No worries at all! I have no problem sorting through everything, but I was hoping to save myself a bit of eyesight. Thank you for your help regardless!

          – Brad
          11 hours ago











        • @DavidCarlisle Come on, don't advocate crazy solutions to problems that can be trivially solved on the other side of the conversion. Brad should simply do the replacement in Mathematica.

          – Bruno Le Floch
          7 hours ago











        • @BrunoLeFloch I'd already said that in comments under the question, or just use perl or any other sane mechanism, but it's easy for you to see that this is beyond what's reasonable to do in tex as you know more than most on where tex's limits are, but I think it is still useful as a general rule to sketch how far you can get (and in particular what you can not reasonably do) in tex for this kind of question.

          – David Carlisle
          7 hours ago

















        Thank you for your answer - this is not quite what I'm after. But since this is not quite a conventional method, perhaps I am better simply going through and replacing things manually... I am moreso hoping to simply find a particular string and replace it with something else.

        – Brad
        11 hours ago





        Thank you for your answer - this is not quite what I'm after. But since this is not quite a conventional method, perhaps I am better simply going through and replacing things manually... I am moreso hoping to simply find a particular string and replace it with something else.

        – Brad
        11 hours ago













        @Brad that really isn't how tex works:-) (unless you are using luatex)

        – David Carlisle
        11 hours ago





        @Brad that really isn't how tex works:-) (unless you are using luatex)

        – David Carlisle
        11 hours ago













        No worries at all! I have no problem sorting through everything, but I was hoping to save myself a bit of eyesight. Thank you for your help regardless!

        – Brad
        11 hours ago





        No worries at all! I have no problem sorting through everything, but I was hoping to save myself a bit of eyesight. Thank you for your help regardless!

        – Brad
        11 hours ago













        @DavidCarlisle Come on, don't advocate crazy solutions to problems that can be trivially solved on the other side of the conversion. Brad should simply do the replacement in Mathematica.

        – Bruno Le Floch
        7 hours ago





        @DavidCarlisle Come on, don't advocate crazy solutions to problems that can be trivially solved on the other side of the conversion. Brad should simply do the replacement in Mathematica.

        – Bruno Le Floch
        7 hours ago













        @BrunoLeFloch I'd already said that in comments under the question, or just use perl or any other sane mechanism, but it's easy for you to see that this is beyond what's reasonable to do in tex as you know more than most on where tex's limits are, but I think it is still useful as a general rule to sketch how far you can get (and in particular what you can not reasonably do) in tex for this kind of question.

        – David Carlisle
        7 hours ago





        @BrunoLeFloch I'd already said that in comments under the question, or just use perl or any other sane mechanism, but it's easy for you to see that this is beyond what's reasonable to do in tex as you know more than most on where tex's limits are, but I think it is still useful as a general rule to sketch how far you can get (and in particular what you can not reasonably do) in tex for this kind of question.

        – David Carlisle
        7 hours ago











        4














        Inasmuch as I love doing crazy things in TeX, do the replacements in Mathematica! This will save you a huge amount of pain. For instance,



        expr = (a[1] + a[2])/Sqrt[a[3]]
        expr /. {a[1] -> [Alpha], a[2] -> [Beta], a[3] -> [Gamma]} // TeXForm


        gives frac{alpha +beta }{sqrt{gamma }} with no need to tweak the output.






        share|improve this answer




























          4














          Inasmuch as I love doing crazy things in TeX, do the replacements in Mathematica! This will save you a huge amount of pain. For instance,



          expr = (a[1] + a[2])/Sqrt[a[3]]
          expr /. {a[1] -> [Alpha], a[2] -> [Beta], a[3] -> [Gamma]} // TeXForm


          gives frac{alpha +beta }{sqrt{gamma }} with no need to tweak the output.






          share|improve this answer


























            4












            4








            4







            Inasmuch as I love doing crazy things in TeX, do the replacements in Mathematica! This will save you a huge amount of pain. For instance,



            expr = (a[1] + a[2])/Sqrt[a[3]]
            expr /. {a[1] -> [Alpha], a[2] -> [Beta], a[3] -> [Gamma]} // TeXForm


            gives frac{alpha +beta }{sqrt{gamma }} with no need to tweak the output.






            share|improve this answer













            Inasmuch as I love doing crazy things in TeX, do the replacements in Mathematica! This will save you a huge amount of pain. For instance,



            expr = (a[1] + a[2])/Sqrt[a[3]]
            expr /. {a[1] -> [Alpha], a[2] -> [Beta], a[3] -> [Gamma]} // TeXForm


            gives frac{alpha +beta }{sqrt{gamma }} with no need to tweak the output.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 7 hours ago









            Bruno Le FlochBruno Le Floch

            34.2k5115211




            34.2k5115211























                3














                Along the vein of my cited Translate in-line equations to TeX code (Any Package?), but a much simpler parsing request, I provide translate.



                No catcode changes required. It will retain surrounding math style, etc.



                documentclass{article}
                usepackage{listofitems}
                newtokseqtoks
                newcommandaddtoeqtoks[1]{expandaftereqtoksexpandafter{theeqtoks#1}}
                newcommandtranslate[1]{%
                setsepchar{[||]}%
                readlistmyeqn{#1}%
                eqtoks{}%
                foreachitemxinmyeqn{%
                ifnumxcnt=1else%
                if[myeqnsep[numexprxcnt-1]addtoeqtoks{_bgroup}fi%
                if]myeqnsep[numexprxcnt-1]addtoeqtoks{egroup}fi%
                fi%
                expandafteraddtoeqtoksexpandafter{x}%
                }%
                theeqtoks%
                }
                begin{document}
                [
                translate{a[1]+a[2]+b[c+d[3]] + x}
                ]
                end{document}


                enter image description here






                share|improve this answer




























                  3














                  Along the vein of my cited Translate in-line equations to TeX code (Any Package?), but a much simpler parsing request, I provide translate.



                  No catcode changes required. It will retain surrounding math style, etc.



                  documentclass{article}
                  usepackage{listofitems}
                  newtokseqtoks
                  newcommandaddtoeqtoks[1]{expandaftereqtoksexpandafter{theeqtoks#1}}
                  newcommandtranslate[1]{%
                  setsepchar{[||]}%
                  readlistmyeqn{#1}%
                  eqtoks{}%
                  foreachitemxinmyeqn{%
                  ifnumxcnt=1else%
                  if[myeqnsep[numexprxcnt-1]addtoeqtoks{_bgroup}fi%
                  if]myeqnsep[numexprxcnt-1]addtoeqtoks{egroup}fi%
                  fi%
                  expandafteraddtoeqtoksexpandafter{x}%
                  }%
                  theeqtoks%
                  }
                  begin{document}
                  [
                  translate{a[1]+a[2]+b[c+d[3]] + x}
                  ]
                  end{document}


                  enter image description here






                  share|improve this answer


























                    3












                    3








                    3







                    Along the vein of my cited Translate in-line equations to TeX code (Any Package?), but a much simpler parsing request, I provide translate.



                    No catcode changes required. It will retain surrounding math style, etc.



                    documentclass{article}
                    usepackage{listofitems}
                    newtokseqtoks
                    newcommandaddtoeqtoks[1]{expandaftereqtoksexpandafter{theeqtoks#1}}
                    newcommandtranslate[1]{%
                    setsepchar{[||]}%
                    readlistmyeqn{#1}%
                    eqtoks{}%
                    foreachitemxinmyeqn{%
                    ifnumxcnt=1else%
                    if[myeqnsep[numexprxcnt-1]addtoeqtoks{_bgroup}fi%
                    if]myeqnsep[numexprxcnt-1]addtoeqtoks{egroup}fi%
                    fi%
                    expandafteraddtoeqtoksexpandafter{x}%
                    }%
                    theeqtoks%
                    }
                    begin{document}
                    [
                    translate{a[1]+a[2]+b[c+d[3]] + x}
                    ]
                    end{document}


                    enter image description here






                    share|improve this answer













                    Along the vein of my cited Translate in-line equations to TeX code (Any Package?), but a much simpler parsing request, I provide translate.



                    No catcode changes required. It will retain surrounding math style, etc.



                    documentclass{article}
                    usepackage{listofitems}
                    newtokseqtoks
                    newcommandaddtoeqtoks[1]{expandaftereqtoksexpandafter{theeqtoks#1}}
                    newcommandtranslate[1]{%
                    setsepchar{[||]}%
                    readlistmyeqn{#1}%
                    eqtoks{}%
                    foreachitemxinmyeqn{%
                    ifnumxcnt=1else%
                    if[myeqnsep[numexprxcnt-1]addtoeqtoks{_bgroup}fi%
                    if]myeqnsep[numexprxcnt-1]addtoeqtoks{egroup}fi%
                    fi%
                    expandafteraddtoeqtoksexpandafter{x}%
                    }%
                    theeqtoks%
                    }
                    begin{document}
                    [
                    translate{a[1]+a[2]+b[c+d[3]] + x}
                    ]
                    end{document}


                    enter image description here







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered 10 hours ago









                    Steven B. SegletesSteven B. Segletes

                    159k9204413




                    159k9204413























                        1














                        Here's a solution. The command addreplacementrule{text-to-replace}{replacement-text} specifies replacements to make. Then the command replace{some math} does the replacements.



                        This would probably be better done with the l3regex package or really find and replace as many other people mentioned.



                        documentclass{article}
                        makeatletter
                        newtoksri@activechars
                        defaddreplacementrule#1#2{addreplacementrule@#1@nil{#2}}
                        defaddreplacementrule@#1#2@nil#3{%
                        ri@activecharsexpandafter{theri@activechars\#1}%
                        ri@maketransitions#2@nil{#1}{#3}%
                        }

                        defreplace#1{%
                        begingroup
                        def\##1{%
                        bgrouplccode`~=`##1lowercase{egroup
                        def~{ri@continue{##1}}%
                        }%
                        catcode`##1=active
                        }%
                        theri@activechars
                        scantokens{#1}%
                        endgroup
                        }

                        defri@maketransitions#1#2@nil#3#4{%
                        deftemp{#2}%
                        ifxtempempty
                        expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{#4}%
                        letnextrelax
                        else
                        expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{ri@continue{#3#1}}%
                        defnext{ri@maketransitions#2@nil{#3#1}{#4}}%
                        fi
                        next
                        }


                        defri@continue#1#2{%
                        @ifundefined{ri@lookup@detokenize{#1#2}}{%
                        detokenize{#1}#2%
                        }{%
                        csname ri@lookup@detokenize{#1#2}endcsname
                        }%
                        }


                        begin{document}
                        addreplacementrule{x[2]}{x_2}
                        addreplacementrule{x[3]}{x^2}

                        $x+1+x[2]+x[3]+x[1]$

                        replace{$x+1+x[2]+x[3]+x[1]$}
                        end{document}


                        enter image description here






                        share|improve this answer






























                          1














                          Here's a solution. The command addreplacementrule{text-to-replace}{replacement-text} specifies replacements to make. Then the command replace{some math} does the replacements.



                          This would probably be better done with the l3regex package or really find and replace as many other people mentioned.



                          documentclass{article}
                          makeatletter
                          newtoksri@activechars
                          defaddreplacementrule#1#2{addreplacementrule@#1@nil{#2}}
                          defaddreplacementrule@#1#2@nil#3{%
                          ri@activecharsexpandafter{theri@activechars\#1}%
                          ri@maketransitions#2@nil{#1}{#3}%
                          }

                          defreplace#1{%
                          begingroup
                          def\##1{%
                          bgrouplccode`~=`##1lowercase{egroup
                          def~{ri@continue{##1}}%
                          }%
                          catcode`##1=active
                          }%
                          theri@activechars
                          scantokens{#1}%
                          endgroup
                          }

                          defri@maketransitions#1#2@nil#3#4{%
                          deftemp{#2}%
                          ifxtempempty
                          expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{#4}%
                          letnextrelax
                          else
                          expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{ri@continue{#3#1}}%
                          defnext{ri@maketransitions#2@nil{#3#1}{#4}}%
                          fi
                          next
                          }


                          defri@continue#1#2{%
                          @ifundefined{ri@lookup@detokenize{#1#2}}{%
                          detokenize{#1}#2%
                          }{%
                          csname ri@lookup@detokenize{#1#2}endcsname
                          }%
                          }


                          begin{document}
                          addreplacementrule{x[2]}{x_2}
                          addreplacementrule{x[3]}{x^2}

                          $x+1+x[2]+x[3]+x[1]$

                          replace{$x+1+x[2]+x[3]+x[1]$}
                          end{document}


                          enter image description here






                          share|improve this answer




























                            1












                            1








                            1







                            Here's a solution. The command addreplacementrule{text-to-replace}{replacement-text} specifies replacements to make. Then the command replace{some math} does the replacements.



                            This would probably be better done with the l3regex package or really find and replace as many other people mentioned.



                            documentclass{article}
                            makeatletter
                            newtoksri@activechars
                            defaddreplacementrule#1#2{addreplacementrule@#1@nil{#2}}
                            defaddreplacementrule@#1#2@nil#3{%
                            ri@activecharsexpandafter{theri@activechars\#1}%
                            ri@maketransitions#2@nil{#1}{#3}%
                            }

                            defreplace#1{%
                            begingroup
                            def\##1{%
                            bgrouplccode`~=`##1lowercase{egroup
                            def~{ri@continue{##1}}%
                            }%
                            catcode`##1=active
                            }%
                            theri@activechars
                            scantokens{#1}%
                            endgroup
                            }

                            defri@maketransitions#1#2@nil#3#4{%
                            deftemp{#2}%
                            ifxtempempty
                            expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{#4}%
                            letnextrelax
                            else
                            expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{ri@continue{#3#1}}%
                            defnext{ri@maketransitions#2@nil{#3#1}{#4}}%
                            fi
                            next
                            }


                            defri@continue#1#2{%
                            @ifundefined{ri@lookup@detokenize{#1#2}}{%
                            detokenize{#1}#2%
                            }{%
                            csname ri@lookup@detokenize{#1#2}endcsname
                            }%
                            }


                            begin{document}
                            addreplacementrule{x[2]}{x_2}
                            addreplacementrule{x[3]}{x^2}

                            $x+1+x[2]+x[3]+x[1]$

                            replace{$x+1+x[2]+x[3]+x[1]$}
                            end{document}


                            enter image description here






                            share|improve this answer















                            Here's a solution. The command addreplacementrule{text-to-replace}{replacement-text} specifies replacements to make. Then the command replace{some math} does the replacements.



                            This would probably be better done with the l3regex package or really find and replace as many other people mentioned.



                            documentclass{article}
                            makeatletter
                            newtoksri@activechars
                            defaddreplacementrule#1#2{addreplacementrule@#1@nil{#2}}
                            defaddreplacementrule@#1#2@nil#3{%
                            ri@activecharsexpandafter{theri@activechars\#1}%
                            ri@maketransitions#2@nil{#1}{#3}%
                            }

                            defreplace#1{%
                            begingroup
                            def\##1{%
                            bgrouplccode`~=`##1lowercase{egroup
                            def~{ri@continue{##1}}%
                            }%
                            catcode`##1=active
                            }%
                            theri@activechars
                            scantokens{#1}%
                            endgroup
                            }

                            defri@maketransitions#1#2@nil#3#4{%
                            deftemp{#2}%
                            ifxtempempty
                            expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{#4}%
                            letnextrelax
                            else
                            expandafterdefcsname ri@lookup@detokenize{#3#1}endcsname{ri@continue{#3#1}}%
                            defnext{ri@maketransitions#2@nil{#3#1}{#4}}%
                            fi
                            next
                            }


                            defri@continue#1#2{%
                            @ifundefined{ri@lookup@detokenize{#1#2}}{%
                            detokenize{#1}#2%
                            }{%
                            csname ri@lookup@detokenize{#1#2}endcsname
                            }%
                            }


                            begin{document}
                            addreplacementrule{x[2]}{x_2}
                            addreplacementrule{x[3]}{x^2}

                            $x+1+x[2]+x[3]+x[1]$

                            replace{$x+1+x[2]+x[3]+x[1]$}
                            end{document}


                            enter image description here







                            share|improve this answer














                            share|improve this answer



                            share|improve this answer








                            edited 10 hours ago

























                            answered 10 hours ago









                            Hood ChathamHood Chatham

                            4,3541428




                            4,3541428






























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