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Perform the product of a matrix by a vector.

The matrix is a data structure of the matr_asse type: it has real or complex values, symmetric or non-symmetric. The vector is a data structure of the type cham_no. It has real or complex values. We require that matrix and vector both have real values or both have complex values (otherwise use the COMB_MATR_ASSE [U4.72.01] or CREA_CHAMP [U4.72.04] commands first) and that they share the same numbering (see command NUME_DDL [U4.61.11]) and that they share the same numbering (see command []).

Produce a cham_no concept.