From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Loris Bennett" <loris.bennett@fu-berlin.de>
Subject: Re: Placement of \makeatletter with \beamer@frametextheight
Date: Thu, 29 Nov 2018 16:12:03 +0100
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In-Reply-To: <87ftvkf1bz.fsf@fastmail.fm> (Joost Kremers's message of "Thu, 29
	Nov 2018 14:41:20 +0100")
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Cc: Joost Kremers <joostkremers@fastmail.fm>

Joost Kremers <joostkremers@fastmail.fm> writes:

> On Thu, Nov 29 2018, Gustavo Barros wrote:
>> Louis,
>>
>> a hunch, which might work.
>> It seems that, if you try to set the length in your preamble,
>> `\beamer@frametextheight` is not yet defined.
>> So, you might try the hook `\AtBeginDocument` to see if the definition comes
>> at
>> a better timing.
>>
>>  #+LATEX_HEADER:
>> \newlength\mytextheight\AtBeginDocument{\makeatletter\setlength\mytextheight{\beamer@frametextheight}\makeatother}
>>
>> As I said, it's a hunch, for I haven't tested. But I think it may be it.
>
> Why not put the entire thing inside \AtBeginDocument?
>
> To the OP: \paperheight does seem to be available in Beamer. Couldn't you use
> that?

Using

  #+LATEX_HEADER: \newlength\mytextheight\AtBeginDocument{\makeatletter\setlength\mytextheight{\beamer@frametextheight}\makeatother}

also leads to the error

  ! Undefined control sequence.
  <argument> \beamer

So I went with \paperheight instead, which works fine.

Regards

Loris

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