# KSPCR

This code implements the (preconditioned) conjugate residuals method

### Options Database Keys

see KSPSolve() -

Notes: The operator and the preconditioner must be symmetric for this method. The preconditioner must be POSITIVE-DEFINITE and the operator POSITIVE-SEMIDEFINITE

### See Also

KSPCreate(), KSPSetType(), KSPType (for list of available types), KSP, KSPCG

Level:beginner
Location:src/ksp/ksp/impls/cr/cr.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages