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# KSPSYMMLQ

Implements the SYMMLQ method [PS75].

## Notes

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

The preconditioner must be POSITIVE-DEFINITE.

Supports only left preconditioning.

## References

[PS75]

C. C. Paige and M. A. Saunders. Solution of sparse indefinite systems of linear equations. SIAM Journal on Numerical Analysis, 12:617–629, 1975.

## See Also

KSP: Linear System Solvers, `KSPCreate()`, `KSPSetType()`, `KSPType`, `KSP`

## Level

beginner

## Location

src/ksp/ksp/impls/symmlq/symmlq.c

Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages