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    <p><a href="https://stackoverflow.com/questions/12497189/emacs-latex-amount-of-columns-for-tables-matrices-arrays#comment16835580_12498189">As suggested</a> you can make a <a href="http://capitaomorte.github.com/yasnippet/" rel="nofollow noreferrer">YASnippet</a> that according to the amount of letters in the second argument <code>array</code> automatically adds the appropriate amount of <code>&amp;</code>s to the first row of the array:</p> <pre class="lang-lisp prettyprint-override"><code># -*- mode: snippet -*- # name: array # key: arr # expand-env: ((yas/indent-line 'fixed)) # -- \begin{array}{${1:cc}}$0 ${1:$ (let ((row "")) (dotimes (i (- (string-width yas/text) 1) row) (setq row (concat row "&amp; ")))) }\\\\ \end{array} </code></pre> <p>The manual <a href="http://capitaomorte.github.com/yasnippet/snippet-development.html#mirrors-with-transformations" rel="nofollow noreferrer">exemplifies this technique</a>. The line with <code>(yas/indent-line 'fixed)</code> is to avoid AUCTeX indenting the row. The reason for placing the exit point of the snippet (<code>$0</code>) at the end of the declaration of the array rather than at the beginning of the first row is that when placed at the beginning of the first row the exit point does not behave as expected.</p> <p>The following snippet will also add as many rows as there are columns:</p> <pre class="lang-lisp prettyprint-override"><code># -*- mode: snippet -*- # name: array # key: arr # expand-env: ((yas/indent-line 'fixed)) # -- \begin{array}{${1:cc}}$0 ${1:$ (let ((row "") (allrows "")) (dotimes (i (- (string-width yas/text) 1)) (setq row (concat row "&amp; "))) (dotimes (i (string-width yas/text) allrows) (setq allrows (concat allrows row "\\\\\\\\\n")))) }\end{array} </code></pre> <p>A problem with this snippet is that it adds <code>\\</code> even if there only one column but such arrays may be rare.</p> <p>There seems to be problems with adding lisp comments to embedded lisp code in snippets so I simply add a commented version of only the lisp code to explain it:</p> <pre class="lang-lisp prettyprint-override"><code>;; Make an empty row with as many columns as symbols in $1 (the $1 in ;; the snippet which is what yas/text refer to) (let ((row "") (allrows "")) ;; Make an empty row with as many columns as symbols in $1 (dotimes (i (- (string-width yas/text) 1)) (setq row (concat row "&amp; "))) ;; Make as many rows as symbols in $1 (dotimes (i (string-width yas/text) allrows) (setq allrows (concat allrows row "\\\\\\\\\n")))) </code></pre>
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    1. POEmacs & LaTeX: amount of columns for tables/matrices/arrays
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    1. POEmacs & LaTeX: amount of columns for tables/matrices/arrays
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    1. COVery good. I feel sad that I do not understand the code, but either way, thank you. If you would have a way to also influence the amount of rows so that the amount of rows is equal to the amount of columns (I suppose this would be the best estimate of the amount of rows needed), I would suppose it is a sufficient answer to the question (Though we still have the issue that @wvxvw was answering, where, once made, such a table is still difficult to edit).
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    2. CO@Dualinity I have added such a snippet. The code is very simple lisp so if you learn the basics of lisp you should understand it (I barely know the basics to this code may be all ugly!). I have indented the code to make it easier to read. I could add comments to if that would help you. Indeed, the difficulty of editing tables remains. I believe that [using Org-mode](http://stackoverflow.com/a/12498189/789593) is the best solution to make and edit tables. Maybe you should ask for elaboration and examples to that answer instead.
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