[Cmpl] Empty sets in CMPL data files

[Steglich, Mike]

Hi Christopher,

 There will be a new release in autumn. I think I can implement empty sets and put it into this release.

 Thanks,
 Mike Von:  <mailto:christopher.gross at unikat.uni-augsburg.de> Christopher Gross
 Gesendet:  ‎07.‎08.‎2015 14:34
 An:  <mailto:mike.steglich at th-wildau.de> Steglich, Mike ;  <mailto:cmpl at list.coin-or.org> cmpl at list.coin-or.org
 Betreff:  Re: AW: [Cmpl] Empty sets in CMPL data files

Hi Mike,

thanks for the quick reply.

After having a look at the source code in the mean time I came to the 
same conclusion.

However, it would be really nice to have as I am currently using a 
static CMPL file and auto-generate a CMPL data file. The advantage is 
that I do not have to parse my CMPL file and find the parameters section 
but can rather just re-generate the CMPL data file from scratch each 
time I want to solve with new data.

I suppose I will switch from CMPL data files to using include directives 
as that should give me the flexibility I need.

However, I would be happy if you could consider empty sets in CMPL data 
files as a new feature.

Thanks and best regards,

Christopher

On 2015-08-07 13:39, Steglich, Mike wrote:
> Hi Christopher,
>
> It is not possible to define empty sets in a CmplData file. You can
> specify an empty set only  in Cmpl in a parameter section.
>
> Cheers,
> Mike
> ------------------------------------------------------------------------
> Von: Christopher Gross <mailto:christopher.gross at unikat.uni-augsburg.de>
> Gesendet: ‎07.‎08.‎2015 12:54
> An: cmpl at list.coin-or.org <mailto:cmpl at list.coin-or.org>
> Betreff: [Cmpl] Empty sets in CMPL data files
>
>
> Hello,
>
> I am using CMPL with CMPL data files. In these data files I declare some
> sets.
>
> Depending on the input to my model some of these sets might be empty.
> Unfortunately, declaring an empty set with
>
> %mysetname set <>
>
> throws an error:
>
> fatal error: file myinput.cdat line 14: Wrong set or parameter: no data
> element defined
>
> I have experimented with the syntax a bit but so far have been unable to
> come up with something that works to produce an empty set. The CMPL
> manual also wasn't helpful here as empty sets in data files are not
> mentioned at all.
>
> Is there any way to define an empty set in a CMPL data file?
>
> Thanks in advance and best regards,
>
> Christopher
> --
> Christopher Gross, M.Sc.
>
> Lehrstuhl für Health Care Operations/Health Information Management
>
> Universitäres Zentrum für Gesundheitswissenschaften am Klinikum Augsburg
> (UNIKA-T), Neusässer Straße 47, 86156 Augsburg;
>
> Wirtschaftswissenschaftliche Fakultät, Universität Augsburg,
> Universitätsstraße 16, 86159 Augsburg
>
>
> Tel.: +49 821 598-6454
>
> E-Mail:  christopher.gross at unikat.uni-augsburg.de
> Web: http://www.wiwi.uni-augsburg.de/bwl/brunner/
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