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I have to define an indexed set of matrices in AMPL (every set is a variable).

In particular, from 1 to N i want a variable M[i] that is a 4x4 matrix with elements >= 0.

How can i do it ? Thanks so much

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    Usually we do this by creating a 3 dimensional variable M[i,j,k] where j and k are over 1..4. Commented Dec 24, 2018 at 21:57
  • Remember to accept the answer if it solved your problem. Commented Jan 5, 2019 at 12:52

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As suggested by Erwin in a comment, you do this with a single three-dimensional variable.

param n;
var M{1..n,1..4,1..4} >= 0;
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