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Calculate elementary matrices that can be assembled using the ASSE_MATRICE command.

The possible calculation options are:

“AMOR_ACOU”, “mass_meca”, “RIGI_FLUI_STRU”, “rigi_rota”, “AMOR_MECA”,

“MECA_GYRO”, “MASS_MECA_DIAG”, “rigi_geom”, “RIGI_THER”,

“MASS_THER”, “IMPE_MECA”, “rigi_meca”, “MASS_ACOU”, “ONDE_FLUI”,

“RIGI_MECA_HYST”, “MASS_FLUI_STRU”, “RIGI_ACOU”, “RIGI_GYRO”

Produces a matr_elem_\ * data structure.