QPSSetResidualHistory

Sets the array used to hold the residual history. If set, this array will contain the residual norms computed at each iteration of the solver.

PetscErrorCode  QPSSetResidualHistory(QPS qps,PetscReal a[],PetscInt na,PetscBool reset)

Not Collective

	qps	- iterative context obtained from QPSCreate()
	a	- array to hold history
	na	- size of a
	reset	- PETSC_TRUE indicates the history counter is reset to zero for each new linear solve

Array is NOT freed by PETSc so the user needs to keep track of and destroy once the QPS object is destroyed.

'a' is NULL then space is allocated for the history. If 'na' PETSC_DECIDE or PETSC_DEFAULT then an array of length 10000 is allocated.

QPS, set, residual, history, norm