NAME
integrate_option - send options to the integrate function
DESCRIPTION
This class is used to send options to the integrate function when building a form. It allows one to set the quadrature formulae that is used for numerical integration see quadrature_option(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 useful for computing the stream function in the axisymmetric case.
|
lump |
This flag, when set, performs 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 useful for computing a diagonal approximation of the mass matrix for the continuous P1 element.
|
invert |
This flag, when set, performs 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
integrate_option : quadrature_option {
// allocators:
integrate_option();
integrate_option (const integrate_option& fopt);
integrate_option (const quadrature_option& qopt);
integrate_option& operator= (const integrate_option&
fopt);
// data:
bool ignore_sys_coord, lump, invert;
};
SEE ALSO
COPYRIGHT
Copyright (C) 2000-2018 Pierre Saramito <Pierre.Saramito [AT] imag.fr> GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>;. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.