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Comment by KKKKkkkk1 | Hacker News Reader

Writing prose is easy no matter what tool you're using. Now try to typeset a matrix that has annotations for its rows and columns. Say something like

       m n
     [ A B ] m
 X = [ C D ] n
     [ E F ] n

Achieving this in LaTeX deserves a dissertation in and of itself.

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    \documentclass{article}
    \usepackage{blkarray}
    \usepackage{amsmath}
    \begin{document}

    \[ X = \begin{blockarray}{rrr}
    m & n \\
    \begin{block}{[rr]r}
    A & B & m \\
    C & D & n \\
    E & F & n \\
    \end{block}
    \end{blockarray} \]
    \end{document}

Sweet! For some reason I remember having bad interactions between blkarray and other packages, but I can't reproduce anymore...

Or you can use TeXmacs [1], enter such arrays in WYSIWYG and export to LaTeX.

[1] http://texmacs.org/tmweb/home/screenshots.en.html

The result doesn't prove how arduous the process to find that out can be. Latex stackexchange is a rich recourse though, and your help is certainly welcome. I'd still call it LaTe-X :P

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