Re: [bug][ox-latex] Captions in equations

[Vladimir Lomov <lomov.vl@gmail.com>]

Hello,
** Rasmus [2014-01-18 20:36:35 +0100]:

> Hi,

> This example produces invalid LaTeX code:

> #+CAPTION: test
> #+ATTR_LATEX: :mode math :environment pmatrix
> | \alpha | \beta | \gamma |

> Namely,

> \begin{equation}
> \caption{test text}
> \mathbf{H}=\begin{pmatrix}
>  \vdots & 0 & \vdots \\
>  \vdots & H & \vdots \\
>  \vdots & 0 & \vdots \\
> \end{pmatrix}.
> \end{equation}

> But an equation cannot have a caption.

> I'm not sure what the desired behavior is.  (i) To silently drop the
> caption, (ii) to wrap the equation in some sort of float and give it a
> caption; or (iii) to print the text sans the \caption{·}.

> (iii) can be archived with math-prefix.  (ii) is a bit weird, but
> could be archived relatively easy, but it's not really what one would
> expect; it's consistent with how captions work for tables (turned into
> a float when a caption is present).  (i) is also a bit weird, but
> seems the most reasonable to me.

> Since I don't know what the correct behavior is, I don't have a patch
> right now.

IMHO, this is wrong approach. I would consider this example as a special
way to generate a matrix when exporting to LaTeX, then CAPTION is
useless here. Also, HTML export will give differently looking result.

So, generally, question here is what the use-case to have special
transformation of a table for LaTeX export, providing that other export
backends never will do any special with given table (or will apply
different transformation), and to give a CAPTION to a table.

> –Rasmus

---
WBR, Vladimir Lomov

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