1. Principle of the test

This test is used to validate the emission of some messages by the FACTORISER or RESOUDRE commands in the case of a symmetric matrix:

• First case: a blockage is missing. In this case we get FACTOR_20 /77 for LDLT, MULT_FRONT and MUMPS when \(\mathrm{NPREC}>0\) and FACTOR_57 for MUMPS when \(\mathrm{NPREC}<0\).

• Second case: there is an overabundant blockage. We get FACTOR_21 /76 for LDLT, MULT_FRONT, and MUMPS when \(\mathrm{NPREC}>0\) and FACTOR_42 for MUMPS when \(\mathrm{NPREC}<0\).

• Last case: we check that we are sending the message FACTOR_80 when using the parameter TYPE_RESOL =” SYMDEF “of the solver MUMPS when the matrix to be inverted is not symmetric definite positive.