NAME

       form_option_type - send options to the integrate function

DESCRIPTION

       This  class  is  used  to send options to the integrate function when building a form.  It
       allows to set  the  quadrature  formulae  that  is  used  for  numerical  integration  see
       quadrature_option_type(2) and two boolean flags.

FLAGS

       ignore_sys_coord
              This flag has effects only for axisymmetric coordinate systems.  When set, it omits
              the r weight in the r dr dz measure during the numerical integration performed  the
              integrate  function.   This feature is usefull for computing the stream function in
              the axisymmetric case.

       lump   This flag, when set, perfoms a mass lumping procedure on the matrix at the  element
              level:

              a(i,i) := sum(j) a(i,j)

              The resulting matrix is diagonal.  This feature is usefull for computing a diagonal
              approximation of the mass matrix for the continuous P1 element.

       invert This flag, when set, perfoms a local inversion on the matrix at the element level:

              a := inv(a)

              This procedure is allowed only when the global matrix is block diagonal,  e.g.  for
              discontinuous or bubble approximations.  This property is true when basis functions
              have a compact support inside exactly one element.

DEFAULT FLAG VALUES

       All flags are set to false by default.

IMPLEMENTATION

       struct form_option_type : quadrature_option_type {
       // allocators:
         form_option_type();
         form_option_type (const form_option_type& fopt);
         form_option_type (const quadrature_option_type& qopt);
         form_option_type& operator= (const form_option_type& fopt);
       #ifdef TO_CLEAN
         operator quadrature_option_type() const { return *this; }
       #endif // TO_CLEAN
       // data:
         bool ignore_sys_coord, lump, invert;
       };

SEE ALSO

       quadrature_option_type(2)