Hello Alessandro,
the documentation in file doc/gmpl.doc of the source code distribution
ftp://ftp.gnu.org/gnu/glpk/glpk-4.36.pdf
describes the available operators in GMPL.
As you already remarked there is no special matrix multiplication operator.
The sum of products of elements has to be formulated explicitly.
Your examples are perfectly correct:
>> s.t. Constraint1{l in A,d in B} : sum{j in C} D[l,j] * E[j,d] <= 13;
This describes that every element of the matrix
resulting from D*E should be less or equal to 13.
>> sum {j in 1..n} A[i,j] * B[j]
This describes the multiplication of a matrix with a vector.
Best regards
Xypron
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