https://ampl.com/BOOK/EXAMPLES/EXAMPLES2/cut2.run
and the data file is at:
https://ampl.com/BOOK/EXAMPLES/EXAMPLES2/cut.dat
-Original Message-
From: Domingo Alvarez Duarte
Sent: Monday, August 24, 2020 10:34 AM
To: Meketon, Marc ; Andrew Makhorin
; help-glpk@gnu.org
Subject: Re: Adding if/t
On Sat, 2020-08-29 at 15:29 +0200, Domingo Alvarez Duarte wrote:
> Hello !
>
> With this commit I'm close for a proof of concept of GMPL with multi
> problem, multi solve, repeat and let statements.
>
> The let needs work for the dependence hell when update a parameter.
>
> The multi solve
://ampl.com/BOOK/EXAMPLES/EXAMPLES2/cut.dat
-Original Message-
From: Domingo Alvarez Duarte
Sent: Monday, August 24, 2020 10:34 AM
To: Meketon, Marc ; Andrew Makhorin
; help-glpk@gnu.org
Subject: Re: Adding if/then/else statement to GMPL
Hello Meketon !
Could you share your view of how
Hello Andrew !
After replying to your last email I came with this possible solution to
allow multiple solve statements in GMPL:
https://github.com/mingodad/GLPK/commit/b80bcd86f1a78eba753e919a56fb9b976934b237
Cheers !
On 27/8/20 11:44, Domingo Alvarez Duarte wrote:
Hello Andrew !
Thanks
Hello Andrew !
Thanks for reply !
You are right in respect to the original implementation, one possible
way to have multiple solve statements working is to pause the execution
return a code that would tell the caller to generate the problem, solve
it, postsolve and then continue the
nu.org
Subject: Re: Adding if/then/else statement to GMPL
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
Am 25. August 2020 20:17:06 MESZ schrieb Domingo Alvarez Duarte
:
>Hello Heinrich !
>
>Here is better example from examples/shikaku.mod:
>
Just another example where the existing if-then-else expression can be used to
shorten the code.
Anyway comparing a binary to =1 is not a good idea in
Hello Heinrich !
Here is better example from examples/shikaku.mod:
With if/then/else:
=
/* Output solution graphically */
printf "\nSolution:\n";
for { row in rows1 } {
for { col in cols1 } {
if (sum{(i,j,k,l,m,n) in B:
col >= l and col <= n and (row = k or row
> Probably something like MPL (Math Programming
> Language) developed by G.Dantzig in 70's is what you would like to
> have;
> see https://dl.acm.org/doi/10.1145/800184.810495 .
>
I've got a scanned copy of this Tech. Report (May 1968, 92 pages); so if
someone is interested, I can post it via
Well said.
Sent from my mobile
On Aug 24, 2020, at 1:39 PM, Jeffrey Kantor wrote:
Respectfully, and I very much appreciate the careful design of GMPL and its
utility for creating ‘beautiful’ models, I have to disagree. What is being
proposed, I think, is not a general purpose programming
Forwarded Message
From: Jeffrey Kantor
To: Andrew Makhorin
Cc: "Meketon, Marc" , Domingo Alvarez
Duarte , help-glpk@gnu.org
Subject: Re: Adding if/then/else statement to GMPL
Date: Mon, 24 Aug 2020 12:38:42 -0500
> Respectfully, and I very much appreciate the c
On Mon, 2020-08-24 at 14:00 +, 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 disagreed.
>
> Many of the models that I create ultimately are 'iterative'
Forwarded Message
From: Jeffrey Kantor
To: "Meketon, Marc"
Cc: Andrew Makhorin , Domingo Alvarez Duarte , help-glpk@gnu.org
Subject: Re: Adding if/then/else statement to GMPL
Date: Mon, 24 Aug 2020 09:54:33 -0500
> This would be another vote for extending GM
Hello Heinrich !
That example was a silly one only to do a minimal check that the add
if/then/else was working (properly?).
My implementation doesn't seem to need much code and allow a bit better
expressiveness to GMPL.
Another example from examples/pentomino.mod:
Before:
for{i in
, 2020 10:34 AM
To: Meketon, Marc ; Andrew Makhorin
; help-glpk@gnu.org
Subject: Re: Adding if/then/else statement to GMPL
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
On 24.08.20 16:33, Domingo Alvarez Duarte wrote:
> 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
Makhorin
Sent: Sunday, August 23, 2020 2:56 PM
To: Domingo Alvarez Duarte ; help-glpk@gnu.org
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
, August 23, 2020 2:56 PM
To: Domingo Alvarez Duarte ; help-glpk@gnu.org
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
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 !
>
>
>
Hello !
Also I've added the break/continue statements here
https://github.com/mingodad/GLPK/commit/9d70a37b16bd377722eeb3880fcf86bb3b812118
Again any comment/suggestion is welcome !
Cheers !
Hello !
I just added the if/then/else statement to GMPL here
https://github.com/mingodad/GLPK/commit/8984d5db70ce0cc91189911164f5448390026a4a
and hope it could be added to a future release of GLPK/GMPL.
Any comment/suggestion is welcome !
param p symbolic := "dad";
check length(p) ==
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