Example calculations with CALC_MATR_ELEM
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Geometric rigidity matrix for Euler buckling
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.. code-block:: text

    rigigeom = CALC_MATR_ELEM (OPTION =' RIGI_GEOM ', MODELE = mo,
CARA_ELEM = carac, SIEF_ELGA = chsig)


"Mass" matrix in acoustics
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.. code-block:: text

    Massacou = CALC_MATR_ELEM (OPTION =' MASS_ACOU ', MODELE = mo,
CHAM_MATER (= chmat)


Mechanical stiffness matrix
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.. code-block:: text

    rigiblock = CALC_MATR_ELEM (OPTION =' RIGI_MECA ', CHARGE = ch_block)