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In TikZ & PGF Manual for Version 2.10-cvs, page 676/880 there is an example as below:
\foreach \x / \y in {1/2,a/b} {``\x\ and \y''}
It is supposed to yield: "1 and 2""a and b". But for me it gives me nothing only a blank page. Do you know the reason?
The reason is that {``\x\ and \y''} is not a valid tikzpicture drawing command, so it yields nothing. You will get the expected output if using it outside the tikzpicture environment.
\documentclass{standalone}
\usepackage{tikz}
\begin{document}
\foreach \x / \y in {1/2,a/b} {``\x\ and \y''}
\end{document}
In case that you like to have result of your loop in a tikzpictue, than it should be in some node. For example:
\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{chains, positioning}
\begin{document}
\begin{tikzpicture}[start chain=going right, node distance=0pt]
\foreach \x / \y in {1/2,a/b}
{
\node[on chain] {``\x\ and \y''};
}
\end{tikzpicture}
\end{document}
\foreachin atikzpicture?{``\x\ and \y''}is not a validtikzpicturedraw command, so it yields nothing. You will get the expected output if using it outside thetikzpictureenvironment.ikzpicture, as @Amita mentioned in her/his comment. As example of MWE:\documentclass{article} \usepackage{tikz} \usepackage[active,tightpage]{preview} \setlength\PreviewBorder{1em} \begin{document} \begin{preview} \foreach \x / \y in {1/2,a/b} {``\x\ and \y''} \end{preview} \end{document}