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¶

quadrature_option(2)

COPYRIGHT¶

Copyright (C) 2000-2018 Pierre Saramito <Pierre.Saramito@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.