# gf_fem_get¶

Synopsis

n = gf_fem_get(fem F, 'nbdof'[, int cv])
n = gf_fem_get(fem F, 'index of global dof', cv)
d = gf_fem_get(fem F, 'dim')
td = gf_fem_get(fem F, 'target_dim')
P = gf_fem_get(fem F, 'pts'[, int cv])
b = gf_fem_get(fem F, 'is_equivalent')
b = gf_fem_get(fem F, 'is_lagrange')
b = gf_fem_get(fem F, 'is_polynomial')
d = gf_fem_get(fem F, 'estimated_degree')
E = gf_fem_get(fem F, 'base_value',mat p)
ED = gf_fem_get(fem F, 'grad_base_value',mat p)
EH = gf_fem_get(fem F, 'hess_base_value',mat p)
gf_fem_get(fem F, 'poly_str')
string = gf_fem_get(fem F, 'char')
gf_fem_get(fem F, 'display')


Description :

General function for querying information about FEM objects.

Command list :

n = gf_fem_get(fem F, 'nbdof'[, int cv])

Return the number of dof for the fem.

Some specific fem (for example ‘interpolated_fem’) may require a convex number <literal>cv</literal> to give their result. In most of the case, you can omit this convex number.

n = gf_fem_get(fem F, 'index of global dof', cv)

Return the index of global dof for special fems such as interpolated fem.

d = gf_fem_get(fem F, 'dim')

Return the dimension (dimension of the reference convex) of the fem.

td = gf_fem_get(fem F, 'target_dim')

Return the dimension of the target space.

The target space dimension is usually 1, except for vector fem.

P = gf_fem_get(fem F, 'pts'[, int cv])

Get the location of the dof on the reference element.

Some specific fem may require a convex number <literal>cv</literal> to give their result (for example ‘interpolated_fem’). In most of the case, you can omit this convex number.

b = gf_fem_get(fem F, 'is_equivalent')

Return 0 if the fem is not equivalent.

Equivalent fem are evaluated on the reference convex. This is the case of most classical fem’s.

b = gf_fem_get(fem F, 'is_lagrange')

Return 0 if the fem is not of Lagrange type.

b = gf_fem_get(fem F, 'is_polynomial')

Return 0 if the basis functions are not polynomials.

d = gf_fem_get(fem F, 'estimated_degree')

Return an estimation of the polynomial degree of the fem.

This is an estimation for fem which are not polynomials.

E = gf_fem_get(fem F, 'base_value',mat p)

Evaluate all basis functions of the FEM at point <literal>p</literal>.

<literal>p</literal> is supposed to be in the reference convex!

ED = gf_fem_get(fem F, 'grad_base_value',mat p)

Evaluate the gradient of all base functions of the fem at point <literal>p</literal>.

<literal>p</literal> is supposed to be in the reference convex!

EH = gf_fem_get(fem F, 'hess_base_value',mat p)

Evaluate the Hessian of all base functions of the fem at point <literal>p</literal>.

<literal>p</literal> is supposed to be in the reference convex!

gf_fem_get(fem F, 'poly_str')

Return the polynomial expressions of its basis functions in the reference convex.

The result is expressed as a cell array of strings. Of course this will fail on non-polynomial fem’s.

string = gf_fem_get(fem F, 'char')

Ouput a (unique) string representation of the fem.

This can be used to perform comparisons between two different fem objects.

gf_fem_get(fem F, 'display')

displays a short summary for a fem object.