slepc-3.16.1 2021-11-17

STMatSetUp

Build the preconditioner matrix used in STMatSolve().

#include "slepcst.h" 
PetscErrorCode STMatSetUp(ST st,PetscScalar sigma,PetscScalar *coeffs)

Collective on st

	st	- the spectral transformation context
	sigma	- the shift
	coeffs	- the coefficients (may be NULL)

This function is not intended to be called by end users, but by SLEPc solvers that use ST. It builds matrix st->P as follows, then calls KSPSetUp().

    If (coeffs):  st->P = Sum_{i=0:nmat-1} coeffs[i]*sigma^i*A_i.
    else          st->P = Sum_{i=0:nmat-1} sigma^i*A_i