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copied!<p>This is an array how it could be implemented in LaTeX:</p> <pre><code>\documentclass{article} \begin{document} \newcounter{mycounter} \setcounter{mycounter}{1} % ary is any prefix you want, it should not exist as a command. \expandafter\newcommand\csname ary\the\value{mycounter} \endcsname{myfirstelement} \stepcounter{mycounter} \expandafter\newcommand\csname ary\the\value{mycounter} \endcsname{mysecondelement} \csname ary1 \endcsname or \newcounter{index} \setcounter{index}{2} \csname ary\the\value{index} \endcsname \end{document} </code></pre> <p>Run this through LaTeX (latex mydoc.tex or pdflatex mydoc.tex) and you see the output.</p> <p>A short explanation: this creates two commands (with newcommand): ary1 and ary2. The <code>\expandafter</code> is needed because <code>newcommand</code> should not define <code>\csname</code> but the command created by <code>\csname</code> ... <code>\endcsname</code>. <code>\expandafter</code>jumps over the next token, in this case the control sequence <code>\newcommand</code> and executes the next command before TeX sees the <code>\newcommand</code>. That means, the first thing in the newcommand-lines TeX sees is the <code>\csname</code>...<code>\endcsname</code> construct, TeX executes it and then executes <code>\newcommand</code> with the result of the <code>\csname</code>...<code>\endcsname</code> construct. <code>\csname foo\endcsname</code> is the same as <code>\foo</code>, but you can use any character or even spaces in the command created by <code>\csname</code>...<code>\endcsname</code>.</p> <p>This is not trivial. See the great book "TeX by topic" from Victor Eijkhout: <a href="http://eijkhout.net/texbytopic/texbytopic.html" rel="noreferrer">http://eijkhout.net/texbytopic/texbytopic.html</a></p>

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