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# KSPSYMMLQ

This code implements the SYMMLQ method.

### Options Database Keys

| see KSPSolve()

### Notes

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

Supports only left preconditioning.

Reference: Paige & Saunders, 1975.

### See Also

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

### Level

beginner

### Location

src/ksp/ksp/impls/symmlq/symmlq.c
Index of all KSP routines
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Index of all manual pages