GVecEvaluateFunction

Evaluates a function over the specified fields on the locations defined by the underlying grid and its discretization.

#include "gvec.h" 
int GVecEvaluateFunction(GVec v, int numFields, int *fields, PointFunction f, PetscScalar alpha, void *ctx)

	v	- The grid vector
	numFields	- The number of fields to evaluate
	fields	- The fields
	f	- The user provided function
	alpha	- The scalar multiplier
	ctx	- [Optional] A user provided context for the function

The function f should return ordered first by node and then by component.

v^0_0 v^1_0 v^2_0 v^0_1 v^1_1 v^2_1 ... v^0_n v^1_n v^2_n This is the standard for PointFunctions.