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 val.
• The function gradient grad.
• The function Hessian hess.

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 val, grad and hess. 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.