NAME
compose - n-ary function application in expressions (rheolef-7.2)
SYNOPSIS
template
<class Function, class... Expressions>
Expression compose (const Function& f, const
Expressions&... exprs);
DESCRIPTION
Compose a n-ary function f with n fields in interpolate(3) and integrate(3) nonlinear expressions.
EXAMPLE
The compose operator is used for applying a user-provided function to a field:
Float f (Float
u) { return 1/u + sqrt(u); }
...
field vh = interpolate (Xh, compose(f, uh));
When two arguments are involved:
Float g (Float
u, Float v) { return v/u + sqrt(u*v); }
...
field wh = interpolate (Xh, compose(g, uh, vh));
The compose operator supports general n-ary functions and class-functions.
CHARACTERISTIC
The compose function supports also the method of characteristic(2) used e.g. for convection-diffusion problems:
characteristic
X (-delta_t*uh);
test v (Xh);
field lh = integrate (compose(uh,X)*v);
IMPLEMENTATION
This documentation has been generated from file main/lib/compose.h
AUTHOR
Pierre Saramito <Pierre.Saramito [AT] imag.fr>
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.