PETSc version 3.15.5
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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

| 1. | - Magnus R. Hestenes and Eduard Stiefel, Methods of Conjugate Gradients for Solving Linear Systems, Journal of Research of the National Bureau of Standards Vol. 49, No. 6, December 1952 Research Paper 2379

### 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