Re: displaying equations with ob-latex

[Christopher Dimech]

It would please many users if ob-latex was made to behave like other code 
blocks.
One can parse and show equations in emacs using mathjax as has been recently
implemented in texinfo using @display.

Regards
Christopher



> Sent: Friday, May 07, 2021 at 6:14 AM
> From: "Berry, Charles via General discussions about Org-mode." 
> <emacs-orgmode@gnu.org>
> To: "michael-franzese@gmx.com" <michael-franzese@gmx.com>
> Cc: "Help Emacs Orgmode" <emacs-orgmode@gnu.org>
> Subject: Re: displaying equations with ob-latex
>
>
>
> > On May 6, 2021, at 12:50 AM, michael-franzese@gmx.com wrote:
> >
> >
> > I am trying to use ob-latex but equations are not being displayed in emacs
> > when I try to execute with "C-c C-c".
>
> Right. This is because `:results latex replace' is the default for latex src 
> blocks and the leads to wrapping everything in a latex export block.
>
> The context inside that block is `export-block' - i.e. it is not a 
> `greater-element' and cannot contain other elements.  AFAIK, there is not 
> previewer for export blocks - latex or otherwise.
>
> The context for an equation inside a greater-element is latex-fragment. And 
> those can be rendered via `org-latex-preview'.
>
> If you want to render equations for previewing, you could put them into a 
> drawer that is not repeated in the export.
>
> To make this work, you probably want something like this
>
> #+begin_src org
>
>   ,#+name: eqn1
>   ,#+begin_src latex :exports none :results drawer
>   \(y = x\beta + \epsilon\)
>   ,#+end_src
>
>
>   Here is the equation for export:
>
>   ,#+call: eqn1() :results latex
>
> #+end_src
>
> Evaluating the latex src block (C-c C-c) will create a `results' drawer line 
> this:
>
> #+RESULTS: eqn1
> :results:
> \(y = x\beta + \epsilon\)
> :end:
>
> but the `:exports none' will strip that out on export. The call line will 
> create this on export:
>
> #+RESULTS:
> #+begin_export latex
> \(y = x\beta + \epsilon\)
> #+end_export
>
>
> HTH,
>
> Chuck
>
>
>
>
>

---------------------
Christopher Dimech
General Administrator - Naiad Informatics - GNU Project (Geocomputation)
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