NAME

interpolate - Lagrange interpolation of a function

DESCRIPTION

The function interpolation implements the
Lagrange interpolation of a function or a class-function.

SYNOPSIS

template <class Function>
field interpolate (const space& Xh, const Function& f);

EXAMPLE

The following code compute the Lagrange interpolation
pi_h_u of u(x).

  Float u(const point& x);


  ...


  geo omega("square");


  space Xh (omega, "P1");


  field pi_h_u = interpolate (Xh, u);

ADVANCED EXAMPLE

It is possible the replace the function u by a variable of the field type that represents a picewise polynomial function: this invocation allows the reinterpolation of a field on another mesh or with another approximation.

  geo omega2 ("square2");


  space X2h (omega2, "P1");


  field uh2 = interpolate (X2h, pi_h_u);

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.