Re: org-mode can not precess some LATEX environment

[Carsten Dominik <carsten.dominik@gmail.com>]

On Aug 11, 2009, at 4:50 PM, waterloo wrote:

> The manual says math environment need not be in \[ \].

No, this is not what the manual says.

> \[
> \begin{matrix}
> 1&d\\
> d&d\\
> \end{matrix}
> \]
> When I put mouse point on `begin' , I can get preview image through  
> C-c C-x C-l.

Yes

> When I put mouse point on `matrix' , I get two identical matrix with  
> a square between them.

Not anymore after you update

> When I put mouse point on `1&d' , I get a square and \[ at above \]  
> at below .

Not anymore, I think.

But yes, this is in fact ambiguous since org parses out from point to  
see if it is inside a latex fragment.  So you need to put point to the  
right place in this case.  Or, to be on the safe side, do the whole  
subtree with `C-u C-c C-x C-l'.

- Carsten



>
> Thanks
>
>
>
> 2009/8/11 Carsten Dominik <carsten.dominik@gmail.com>
>
> On Aug 11, 2009, at 3:41 PM, Nick Dokos wrote:
>
> waterloo <waterloo2005@gmail.com> wrote:
>
> Excuse me .
> I put the following latex code in an org file , and put point in  
> it ,C-c
> C-x  C-l.  It don't produce the correct image. There is only an square
> appearing . The latex environment is include in amsmath package,  
> which is
> include in Org Format Latex Header defautly.
>
>
> \begin{matrix}
> 1&d\\
> d&d\\
> \end{matrix}
>
>
> I cannot be sure whether "waterloo" sees the same problem (from his
> description, it seems that he gets just an empty square which  
> indicates
> additional/different problems - maybe missing the dvipng program?),
>
> Yes, this seems to be a different problem.  Maybe the problem is  
> thatthe matrix environment must be inside a math environment?
>
>
>
> but
> I do see a problem.  Here is the org file:
>
> ,----
> | #+LaTeX_HEADER: \usepackage{amsmath}
>
> This is actually not necessary, I was mistaken here.
>
>
> |
> | * foo
> |
> | \[
> | \begin{matrix}
> | 1&d\\
> | d&d\\
> | \end{matrix}
> | \]
> |
> `----
>
> I can export this to LaTeX just fine (and I need the additional  
> header,
> at least in that case - I have not tried without it). But when I try  
> the
> preview C-c C-x C-l on the fragment, I get the preview of the matrix
> twice with an empty square separating the two instances.  I attach a  
> PNG
> image of the result. I checked the image that is produced in the  
> ltxpng
> subdirectory: it's just the image of the matrix, no problem there.
>
> Hmm, another fun and interesting bug!
>
> Fixed now.  Thanks.
>
> - Carsten
>
>