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If a matrix definition contains a variable it is defined as constant. This creates wrong results if the matrix was modified in any situation. Also ports are always passed as a constant value.

Example:

    ports in Q in1,
          out Q out1;

    implementation Math{
        Q^{3} A = [0, in1, 1];
        out1 = sum(A);
    }

creates C++ code:

class test_portInMatrixDefinition{
public:
double in1;
double out1;
rowvec CONSTANTCONSTANTVECTOR0;
void init()
{
CONSTANTCONSTANTVECTOR0 = rowvec(3);
CONSTANTCONSTANTVECTOR0(0,0) = 0;
CONSTANTCONSTANTVECTOR0(0,1) = in1;
CONSTANTCONSTANTVECTOR0(0,2) = 1;
}
void execute()
{
colvec A = CONSTANTCONSTANTVECTOR0;
out1 = (accu(A));
}