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# EPSSUBSPACE

EPSSUBSPACE = “subspace” - The simple subspace iteration method.

## Notes

This solver is very basic and is not recommended in general, since it will not be competitive with respect to other solvers.

The implemented method is subspace iteration with Rayleigh-Ritz projection and locking, based on the SRRIT code [Bai and Stewart, 1997].

## References

[Bai97]

Z. Bai and G. W. Stewart. Algorithm 776: SRRIT: a Fortran subroutine to calculate the dominant invariant subspace of a nonsymmetric matrix. ACM Trans. Math. Software, 23(4):494–513, 1997. doi:10.1145/279232.279234.

## See Also

EPS: Eigenvalue Problem Solver, `EPS`, `EPSType`, `EPSSetType()`

## Level

beginner

## Location

src/eps/impls/subspace/subspace.c

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