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Re: Adding if/then/else statement to GMPL

From: Domingo Alvarez Duarte
Subject: Re: Adding if/then/else statement to GMPL
Date: Mon, 24 Aug 2020 16:33:37 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

Hello Meketon !

Could you share your view of how it would be expressed (an ideal model sample) ?

If you want to talk about it, maybe I'll be interested in implement it !

Can you share a collection of models data to be used as base for the test/implementation ?

Cheers !

On 24/8/20 16:00, Meketon, Marc wrote:
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 

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 <> On 
Behalf Of Andrew Makhorin
Sent: Sunday, August 23, 2020 2:56 PM
To: Domingo Alvarez Duarte <>;
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

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.

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