Re: Help with \numexpr

[Keith McKay <mckaymeister@gmail.com>]

Thanks Hans!

With your suggestion and initializing \numberText=1, it workes just the 
way I wanted.  I now have a quick and easy of cataloging my photos.

Thanks again
Keith

On 04/05/2015 18:38, Hans Hagen wrote:
> On 5/4/2015 5:21 PM, Keith McKay wrote:
>> Colleagues
>>
>> I've written some code which should extract photos from a directory and
>> a add couple of lines of description to each photo.  I'm using a
>> variable (\numberText) as a counter which I was hoping to use with
>> \getfromcommalist[string1, string2,...][\numberText] to add one line of
>> text.  However when I try to increment the variable using \numexpr
>> (\numberText=\numberText+1) \relax I get the error "You can't use
>> `\numexpr' in vertical mode".
>>
>> I'm not familiar with \numexpr and there does not seem to be much on the
>> wiki on how to use it.  Any suggestions would be helpfull.
>>
>> Here is the code
>>
>> \setupexternalfigures [directory={/Path/to/the/Photos}]
>>
>> \defineexternalfigure[photo][maxheight=0.4\textheight]
>>
>> \define \numberText{1}
>>
>> \starttext
>>
>> \dostepwiserecurse{141}{146}{1}/% //\recurselevel is part of photo
>> filename. See below./
>>
>> {
>>
>> \externalfigure[sam_0\recurselevel.jpg][photo] \par /% //\recurselevel
>> is part of photo filename/
>>
>> File Name /Path/to/the/Photos/sam_0\recurselevel.jpg\par
>>
>> \getfromcommalist[some text,another text,even more text,much better
>> text,even better text,the ultimate text][\numberText]
>>
>> \commalistelement\par
>>
>> \numexpr (\numberText=\numberText+1) \relax \par
>>
>> \numberText \par
>>
>> }
>>
>> \stoptext
>
> \newcount\FooCounter
>
> \FooCounter=\numexpr\FooCounter+1\relax
>
> or just
>
> \advance\FooCounter\plusone
>
>
>
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