Thanks, Peter.  Duncan also suggested the age of my LaTeX installation might be 
the issue.

Antony

> On 5 May 2024, at 17:52, peter dalgaard <pda...@gmail.com> wrote:
> 
> Hi Antony,
> 
> The absence of \NewDocumentCommand could suggest that your LaTeX installation 
> is too old. Some kind of path messup might also do it, I suppose.
> 
> - Peter
> 
>> On 5 May 2024, at 16:27 , Antony Unwin <un...@math.uni-augsburg.de> wrote:
>> 
>> I have recently updated my Mac to R 4.4.0 and the latest version of RStudio. 
>>  This may or may not be the reason that any Rmd files of mine with citations 
>> fail with the following error on knitting to pdf:
>> 
>> ! Undefined control sequence.
>> l.98 \NewDocumentCommand
>>                       \citeproctext{}{} 
>> 
>> Error: LaTeX failed to compile citeTest.tex.
>> 
>> Knitting to html or to word work fine.  Knitting to pdf without citations 
>> works as well.  Does anyone have a solution?
>> 
>> As a test file I have used the sample Rmd file from Posit with one citation 
>> added.
>> 
>> Thanks for any help
>> 
>> Antony
>> 
>> 
>> Professor (em.) Antony Unwin
>> Mathematics Institute,
>> University of Augsburg, 
>> 86135 Augsburg, Germany
>> 
>> 
>> 
>> 
>>      [[alternative HTML version deleted]]
>> 
>> _______________________________________________
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>> R-SIG-Mac@r-project.org
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> 
> -- 
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
> Email: pd....@cbs.dk  Priv: pda...@gmail.com
> 

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