[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: next question - find some element of a set

From: Mate Hegyhati
Subject: Re: next question - find some element of a set
Date: Thu, 12 Dec 2019 08:29:10 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.1


I'm not exactly sure, what you would like to do, but you could just say, but maybe this answers your question:

set sports;
param  favorite symbolic in sports;

var train{sports} >=0;

s.t. foobar: train[favorite] >=2;

minimize work: sum{f in sports} train[f];


set sports := running cycling swimming;
param favorite := 'running';


So put ' around the name for a symbolic parameter, and also don't put comma between set elements.

I hope this helped. If not, please clarify your situation.

All the best,


set := A, B, C;

param some_element_in_set, symbolic := ?????;

The closest I saw was in this old help-glpk email:

Which says:

set S;

param ref{i in 1..card(S)}, symbolic, in S;

# ref[i] refers to i-th element of S;

param a{S};

... a[ref[i]]   ...  # means a[i-th element of S]

But I cannot get this to work.  If I could get it to work, then I would do something like: param some_element_in_set := ref[1];

BTW, I’m still hoping that someone will help solve how to work the sudoku_excel.mod example in the ‘examples\sql’ directory of the GLPK directory under Windows 10 64bit.  I still cannot get that to work.


reply via email to

[Prev in Thread] Current Thread [Next in Thread]