STMatSetUp

Build the preconditioner matrix used in STMatSolve().

Synopsis

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

Collective

Input Parameters

• st - the spectral transformation context

• sigma - the shift

• coeffs - the coefficients (may be NULL)

Note

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

See Also

STMatSolve()

Level

developer

Location

src/sys/classes/st/interface/stsolve.c

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