Help with \numexpr

Help with \numexpr

[Keith McKay]

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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



Thanks
Keith



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Re: Help with \numexpr

[Hans Hagen]

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



-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Help with \numexpr

[Keith McKay]

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
>
>
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>                                              | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________ 
>
> If your question is of interest to others as well, please add an entry 
> to the Wiki!
>
> maillist : ntg-context@ntg.nl / 
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________