Ytdyklly

This problem occurs when I am trying to improve my answer in this question.

You can compile this code very well

documentclass[tikz]{standalone}

usetikzlibrary{bending,decorations.text}

begin{document}

begin{tikzpicture}

sffamily

node (a) at (-2,0) {probability};

node[align=center] (b) at (2,0) {percent\change};

draw[-latex,postaction={decorate,decoration={raise=1ex,text along path,text align=center,text={multiply by 100}}}] (a) to[out=60,in=120] (b);

end{tikzpicture}

end{document}

but don't compile this code!

documentclass[tikz]{standalone}

usetikzlibrary{bending,decorations.text}

begin{document}

begin{tikzpicture}

sffamily

node (a) at (-2,0) {probability};

node[align=center] (b) at (2,0) {percent\change};

draw[-latex,postaction={decorate,decoration={raise=1ex,text along path,text align=center,text={multiply by 100%}}}] (a) to[out=60,in=120] (b);

end{tikzpicture}

end{document}

I have been waiting for more than 200 seconds

Why? I just want to add a percent symbol (%)!

I think TikZ understood my % as %, but removing the throws many errors.

I even used siunitx, but got the same result.

documentclass[tikz]{standalone}

usetikzlibrary{bending,decorations.text}

usepackage{siunitx}

begin{document}

begin{tikzpicture}

sffamily

node (a) at (-2,0) {probability};

node[align=center] (b) at (2,0) {percent\change};

draw[-latex,postaction={decorate,decoration={raise=1ex,text along path,text align=center,text={multiply by SI{100}{percent}}}}] (a) to[out=60,in=120] (b);

end{tikzpicture}

end{document}

So, what's going on?

You only need to wrap % into {...}.

documentclass[tikz]{standalone}

usetikzlibrary{bending,decorations.text}

begin{document}

begin{tikzpicture}

sffamily

node (a) at (-2,0) {probability};

node[align=center] (b) at (2,0) {percent\change};

draw[-latex,postaction={decorate,decoration={raise=1ex,text along path,text

align=center,text={multiply by 100{%}}}}] (a) to[out=60,in=120] (b);

end{tikzpicture}

end{document}

You can make this work by changing the % character to not be the comment character anymore using catcode:

documentclass[tikz]{standalone}

usetikzlibrary{bending,decorations.text}

begin{document}

begin{tikzpicture}

sffamily

node (a) at (-2,0) {probability};

node[align=center] (b) at (2,0) {percent\change};

begin{scope}

catcode`%=12

draw[-latex,postaction={decorate,decoration={raise=1ex,text along path,text

align=center,text={multiply by 100%}}}] (a) to[out=60,in=120] (b);

end{scope}

end{tikzpicture}

end{document}