Syntax
=====

.. code-block:: text

    /table
    /evol_elas = CALC_BT (
        ◇ RESU_BT = co,
        ◆ RESULTAT = evol_noli/evol_elas,
        ◇ INST = float,
        ◆ DDL_IMPO = _F (
             ◆ GROUP_NO = text,
             ◇ DY = float,
             ◇ DX = float,
          ),
        ◆ FORCE_NODALE = _F (
             ◆ GROUP_NO = text,
             ◇ FY = float,
             ◇ FX = float,
          ),
        ◆ BETON = subdue,
        ◆ ACIER = subdue,
        ◆ GROUP_MA_EXT = text,
        ◇ GROUP_MA_INT = text,
        ◇ SCHEMA =/"SECTION" (by default),
                   /"TOPO ",
        ◆ SIGMA_C = float,
        ◆ SIGMA_Y = float,
        ◆ PAS_X = float,
        ◆ PAS_Y = float,
        ◇ TOLE_BASE = float (default: 0.01),
        ◇ TOLE_BT = float,
        ◇ NMAX_ITER = int (default: 150),
        ◇ RESI_RELA_TOPO = float (default: 1e-06),
        ◇ RESI_RELA_SECTION = float (default: 1e-05),
        ◇ CRIT_SECTION = float (default: 0.5),
        ◇ CRIT_ELIM = float (default: 0.5),
        ◆ SECTION_MINI = float,
        ◆ LONGUEUR_MAX = float,
        ◇ INIT_ALEA = int,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices