In some other circumstances, however, it is so convenient to keep changing the value of a parameter (or variable). My understanding is that this is not possible with MathProg. If I am wrong, I would appreciate your response. If I am not wrong, just ignore this message.
Thanks.
On Fri, Oct 15, 2010 at 2:19 PM, Andrew Makhorin
<address@hidden> wrote:
> I am new to MathProg, and a former user of Ampl. I have been trying to
> create an auxiliary variable that has nothing to do the model, but to
> use for reporting output. For example, I am roughly trying to do the
> following:
>
> define variable named counter
> counter=0
> for (i in Relevant Set)
> if (i > 100) counter = counter+1
>
> This way, I want to report how many of the variables exceed 100.
>
> In Ampl, I was able to define a variable as usual ( var counter,
> integer;) and update its value via let command (let counter:=counter
> +1).
>
> I will appreciate if you could help me on this.
param counter := sum{i in Relevant Set: i > 100} 1;
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_________________________________________
Suleyman Demirel - Office: (734) 647-3167
PhD Candidate in Operations Management
Stephen M. Ross School of Business
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