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From: Julius Dittmar <Julius.Dittmar@gmx.de>
Subject: Re: Placement of \makeatletter with \beamer@frametextheight
Date: Thu, 29 Nov 2018 09:13:59 +0100
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Hi Loris,

I don't know beamer enough to propose an elegant solution. Nonetheless I
have ideas what might go wrong here.

Am 29.11.18 um 08:17 schrieb Loris Bennett:
>> #+latex_header: \makeatletter\let\mytextheight\beamer@frametexheight\makeatother
>> #+attr_latex: :height 0.75\mytextheight

First, \let copies the at-the-moment-of-definition version of
\beamer@frametexheight to \mytextheight. This happens in the preamble.

I expect beamer to set up things like frame height at the begin of the
document (exactly the \begin{document} line), not earlier. Thus at the
point of that \let, that length isn't what you want yet.

Solution to this:
#+begin_export latex
\makeatletter...
#+end_export

Second, \let creates a macro whereas it then is used as a length for the
figure. I doubt that is possible.

If that's the reason, you might try

#+begin_export latex
\newlength\mytextheight
\makeatletter
\setlength\mytextheight{\beamer@frametexheight}
\makeatother
#+end_export

Perhaps this gives you a starting point to further play with it.

HTH,
Julius