petsc-3.6.2 2015-10-02
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# 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. Support only for left preconditioning.

### References

Methods of Conjugate Gradients for Solving Linear Systems, Magnus R. Hestenes and Eduard Stiefel, Journal of Research of the National Bureau of Standards Vol. 49, No. 6, December 1952 Research Paper 2379 pp. 409--436.

### 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