Syntax
====
               

.. code-block:: text

    evol_elas = MECA_STATIQUE (
        ◇ reuse = <objet de RESULTAT >,
        ◇ & RESULTAT = evol_elas,
        ◆ MODELE = model,
        ◆ | CHAM_MATER = cham_master,
          | CARA_ELEM = cara_elem,
        # If: exists (" CARA_ELEM ")
            ◇ EXCIT = _F (
                 ◆ CHARGE = char_cine_meca/char_meca,
                 ◇ FONC_MULT = function/formula/table cloth,
                 ◇ TYPE_CHARGE = "FIXE_CSTE ",
              ),
        # If: not exists (" CARA_ELEM ")
            ◆ EXCIT = _F (
                 ◆ CHARGE = char_cine_meca/char_meca,
                 ◇ FONC_MULT = function/formula/table cloth,
                 ◇ TYPE_CHARGE = "FIXE_CSTE ",
              ),
        ◆/INST = float,
          /LIST_INST = listr8,
        # If: exists (" LIST_INST ")
            ◇ INST_INIT = float,
            ◇ INST_FIN = float,
        ◇ OPTION =/"SANS ",
                   /"SIEF_ELGA" (by default),
        SOLVEUR = _F (
             ◇ METHODE =/"GCPC ",
                         /"LDLT ",
                         /"MULT_FRONT ",
                         /"MUMPS" (by default),
                         /"PETSC ",
             # If: equal_to (" METHODE ", 'MULT_FRONT')
                 ◇ RENUM =/"MD",
                           /"MDA" (by default),
                 ◇ NPREC = int (default: 8),
                 ◇ ELIM_LAGR =/"NON" (by default),
                               /"OUI ",
                 ◇ STOP_SINGULIER =/"NON ",
                                    /"OUI" (by default),
             # If: equal_to (" METHODE ", 'LDLT')
                 ◇ RENUM = "RCMK ",
                 ◇ NPREC = int (default: 8),
                 ◇ ELIM_LAGR =/"NON" (by default),
                               /"OUI ",
                 ◇ STOP_SINGULIER =/"NON ",
                                    /"OUI" (by default),
             # If: equal_to (" METHODE ", 'MUMPS')
                 ◇ RENUM =/"AMD ",
                           /"AMF ",
                           /"AUTO" (by default),
                           /"METIS ",
                           /"PARMETIS ",
                           /"PORD ",
                           /"PTSCOTCH ",
                           /"QAMD ",
                           /"SCOTCH ",
                 ◇ NPREC = int (default: 8),
                 ◇ ELIM_LAGR =/"LAGR2" (by default),
                               /"NON ",
                               /"OUI ",
                 ◇ STOP_SINGULIER =/"NON ",
                                    /"OUI" (by default),
                 ◇ TYPE_RESOL =/"AUTO" (by default),
                                /"NONSYM ",
                                /"SYMDEF ",
                                /"SYMGEN ",
                 ◇ ACCELERATION =/"AUTO" (by default),
                                  /"EN",
                                  /"FR+",
                                  /"FR++",
                                  /"LR",
                                  /"LR+",
                                  /"LR++",
                 ◇ LOW_RANK_SEUIL = float (default: 0.0),
                 ◇ PRETRAITEMENTS =/"AUTO" (by default),
                                    /"SANS ",
                 ◇ POSTTRAITEMENTS =/"AUTO" (by default),
                                     /"FORCE ",
                                     /"MINI ",
                                     /"SANS ",
                 ◇ PCENT_PIVOT = int (default: 35),
                 ◇ REDUCTION_MPI = int (default: 0),
                 ◇ NB_RHS = int (default: 1),
                 ◇ RESI_RELA = float (default: 1e-06),
                 ◇ GESTION_MEMOIRE =/"AUTO" (by default),
                                     /"EVAL ",
                                     /"IN_CORE ",
                                     /"OUT_OF_CORE ",
                 ◇ MATR_DISTRIBUEE =/"NON" (by default),
                                     /"OUI ",
             # If: equal_to (" METHODE ", 'GCPC')
                 ◇ ELIM_LAGR =/"NON" (by default),
                               /"OUI ",
                 ◇ PRE_COND =/"LDLT_DP ",
                              /"LDLT_INC" (by default),
                              /"LDLT_SP ",
                 ◇ RESI_RELA = float (default: 1e-06),
                 ◇ NMAX_ITER = int (default: 0),
                 # If: equal_to (" PRE_COND ", 'LDLT_INC')
                     ◇ RENUM = "RCMK ",
                     ◇ NIVE_REMPLISSAGE = int (default: 0),
                 # If: is_in (" PRE_COND ", ('LDLT_SP', 'LDLT_DP'))
                     ◇ RENUM =/"METIS ",
                               /"PARMETIS" (by default),
                               /"SANS ",
                     ◇ REAC_PRECOND = int (default: 30),
                     ◇ PCENT_PIVOT = int (default: 20),
                     ◇ GESTION_MEMOIRE =/"AUTO" (by default),
                                         /"IN_CORE ",
                     ◇ LOW_RANK_SEUIL = float (default: 0.0),
             # If: equal_to (" METHODE ", 'PETSC')
                 ◇ ELIM_LAGR =/"NON" (by default),
                               /"OUI ",
                 ◇ MATR_DISTRIBUEE =/"NON" (by default),
                                     /"OUI ",
                 ◇ ALGORITHME =/"CG",
                                /"CR",
                                /"FGMRES" (by default),
                                /"GCR ",
                                /"GMRES ",
                                /"GMRES_LMP ",
                 ◇ OPTION_PETSC = text (default: ""),
                 ◇ PRE_COND =/"BLOC_LAGR ",
                              /"BOOMER ",
                              /"FIELDSPLIT ",
                              /"GAMG ",
                              /"HPDDM ",
                              /"JACOBI ",
                              /"LDLT_DP ",
                              /"LDLT_INC ",
                              /"LDLT_SP" (by default),
                              /"ML",
                              /"SANS ",
                              /"SOR ",
                              /"UTILISATEUR ",
                 ◇ RESI_RELA = float (default: 1e-06),
                 ◇ NMAX_ITER = int (default: 0),
                 # If: equal_to (" PRE_COND ", 'LDLT_INC')
                     ◇ RENUM = "RCMK ",
                     ◇ NIVE_REMPLISSAGE = int (default: 0),
                     ◇ REMPLISSAGE = float (default: 1.0),
                 # If: is_in (" PRE_COND ", ('LDLT_SP', 'LDLT_DP'))
                     ◇ RENUM =/"METIS ",
                               /"PARMETIS" (by default),
                               /"SANS ",
                     ◇ REAC_PRECOND = int (default: 30),
                     ◇ PCENT_PIVOT = int (default: 20),
                     ◇ GESTION_MEMOIRE =/"AUTO" (by default),
                                         /"IN_CORE ",
                     ◇ LOW_RANK_SEUIL = float (default: 0.0),
                 # If: equal_to (" PRE_COND ", 'ML')
                     ◇ RENUM = "SANS ",
                 # If: equal_to (" PRE_COND ", 'BOOMER')
                     ◇ RENUM = "SANS ",
                 # If: equal_to (" PRE_COND ", 'GAMG')
                     ◇ RENUM = "SANS ",
                 # If: equal_to (" PRE_COND ", 'HPDDM')
                     ◇ RENUM = "SANS ",
                 # If: equal_to (" PRE_COND ", 'BLOC_LAGR')
                     ◇ RENUM = "SANS ",
                 # If: is_in (" PRE_COND ", ('FIELDSPLIT'))
                     ◇ RENUM = "SANS ",
                     ◇ PARTITION_CMP = int,
                     ◇ NOM_CMP = text,
                 # If: is_in (" PRE_COND ", ('UTILISATEUR'))
                     ◇ KSP_UTIL = not_checked,
                     ◇ RENUM = "SANS ",
                 # If: is_in (" PRE_COND ", ('JACOBI', '', 'SOR', 'SANS'))
                     ◇ RENUM =/"RCMK ",
                               /"SANS" (by default),
          ),
        ◇ INFO =/1 (by default),
                 /2,
        ◇ TITRE = text,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices