Other Alias

test## DESCRIPTION

These classes are used for test and trial functions
involved in variational formulations.
Variational formulations could be specified by expressions, in
the spirit of c++ embeded languages.
A variable of the **test** type represents the formal argument
(the test-function) in the definition of a linear form, as in:

geo omega ("circle"); space Xh (omega, "P1"); test v(Xh); field lh = integrate (omega, 2*v);For a bilinear form, the test-function represents its second formal argument, while the first one is designed by the

**trial**type:

trial u(Xh); test v(Xh); form m = integrate (omega, u*v), a = integrate (omega, dot(grad(u),grad(v)));The

**field_vf**class is abble to represents either

**test**or

**trial**types: it could be used to formaly define a differential operator, as:

D(u) = (grad(u)+trans(grad(u)))