gf_global_function_get

General function for querying information about global_function objects.

# Calling Sequence

    VALs = gf_global_function_get(global_function GF, 'val',mat PTs)

    GRADs = gf_global_function_get(global_function GF, 'grad',mat PTs)

    HESSs = gf_global_function_get(global_function GF, 'hess',mat PTs)

    s = gf_global_function_get(global_function GF, 'char')

    gf_global_function_get(global_function GF, 'display')

## Description

General function for querying information about global_function objects.

## Command list

- `VALs = gf_global_function_get(global_function GF, 'val',mat PTs)`

  Return `val` function evaluation in `PTs` (column points).

- `GRADs = gf_global_function_get(global_function GF, 'grad',mat PTs)`

  Return `grad` function evaluation in `PTs` (column points). On return, each column of `GRADs` is of the form [Gx,Gy].

- `HESSs = gf_global_function_get(global_function GF, 'hess',mat PTs)`

  Return `hess` function evaluation in `PTs` (column points). On return, each column of `HESSs` is of the form [Hxx,Hxy,Hyx,Hyy].

- `s = gf_global_function_get(global_function GF, 'char')`

  Output a (unique) string representation of the global_function. This can be used to perform comparisons between two different global_function objects. This function is to be completed.

- `gf_global_function_get(global_function GF, 'display')`

  displays a short summary for a global_function object.

## See Also

- getfem types

## Authors

Y. Collette