gf_global_function

Synopsis

GF = gf_global_function('cutoff', int fn, scalar r, scalar r1, scalar r0)
GF = gf_global_function('crack', int fn)
GF = gf_global_function('parser', string val[, string grad[, string hess]])
GF = gf_global_function('product', global_function F, global_function G)
GF = gf_global_function('add', global_function gf1, global_function gf2)

Description :

General constructor for global_function objects.

Global function object is represented by three functions:

• The function <literal>val</literal>.
• The function gradient <literal>grad</literal>.
• The function Hessian <literal>hess</literal>.

this type of function is used as local and global enrichment function. The global function Hessian is an optional parameter (only for fourth order derivative problems).

Command list :

GF = gf_global_function('cutoff', int fn, scalar r, scalar r1, scalar r0)

Create a cutoff global function.

GF = gf_global_function('crack', int fn)

Create a near-tip asymptotic global function for modelling cracks.

GF = gf_global_function('parser', string val[, string grad[, string hess]])

Create a global function from strings <literal>val</literal>, <literal>grad</literal> and <literal>hess</literal>. This function could be improved by using the derivation of the generic assembly language ... to be done.

GF = gf_global_function('product', global_function F, global_function G)

Create a product of two global functions.

GF = gf_global_function('add', global_function gf1, global_function gf2)

Create a add of two global functions.