Hi Peiyu

I probably donâ€™t understand your question, because the number of x(1,?) is in this case n (or in Gams card(n)).

I assume you have n x for k=1 and only some of them contain a solution, and now you want to know how many there are. Let us assume that if x(k,n) is equal to 2, this means you have a solution, and otherwise there is no solution.

You could do this as follows:

Parameter numbersolutions(k) Number of solutions for each k;

Numbersolutions(k) = sum(n$(x(k,n) = 2), 1);

This sums the value of 1 only then when x(k,n) equal is to 1.

Hope this helps

Cheers

Renger

From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of Peiyu Luo

Sent: Wednesday, March 23, 2016 2:09 AM

To: gamsworld

Subject: How to count the number of variables?

Hello, does anyone can help me with counting the number of the solutions?

Suppose I have a set of x(k,n) as following:

x(1,1) = …,

x(1,2) = …,

.

x(1,n) =…,

.

x(k,n) = …,

how can i count the number of variables by dimension “k” or “n”? e.g. how many x(1,n) in the optimal solution? Thanks in advance!

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