I've always felt that GMPL needed if-then-else, for-loops, 'let' statements and the ability to re-solve to be a true modeling language. And Andrew has always disagreed.
Many of the models that I create ultimately are 'iterative' where I need to take the results of one model and use it to setup another model. To me, that is also modeling. GMPL doesn't have it. So often, I use GMPL for an initial model - it is a wonderful language, and I find it faster to code than alternatives. But then when I 'get it right' I have to re-code it in PYOMO or PULP or write directly to an 'lp' file within a Python or C# or other language script. Having the ability to run, adjust variables, add/take away constraints, re-run would be extremely useful, and make GMPL more of a one-stop modeling language. -----Original Message----- From: Help-glpk <[email protected]> On Behalf Of Andrew Makhorin Sent: Sunday, August 23, 2020 2:56 PM To: Domingo Alvarez Duarte <[email protected]>; [email protected] Subject: Re: Adding if/then/else statement to GMPL On Sun, 2020-08-23 at 15:36 +0200, Domingo Alvarez Duarte wrote: > Hello ! > > Also I've added the break/continue statements here > https://github.com/mingodad/GLPK/commit/9d70a37b16bd377722eeb3880fcf86 > bb3b812118 > > > Again any comment/suggestion is welcome ! > > Cheers ! > > > Please note that GNU MathProg is a *modeling* language; it is not a general-purpose programming language. If you need to produce a non-trivial solution report (since all such-like statements are allowed only on the post-solving stage), it would be more practical to write the solution to a temporary file and then process it with a separate program. ________________________________ This e-mail and any attachments may be confidential or legally privileged. If you received this message in error or are not the intended recipient, you should destroy the e-mail message and any attachments or copies, and you are prohibited from retaining, distributing, disclosing or using any information contained herein. Please inform us of the erroneous delivery by return e-mail. Thank you for your cooperation.
