slepc-3.18.1 2022-11-02
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# EPSSetLeftInitialSpace

Specify a basis of vectors that constitute the left initial space, used by two-sided solvers to start the left subspace.

### Synopsis

    #include "slepceps.h"
    PetscErrorCode EPSSetLeftInitialSpace(EPS eps,PetscInt n,Vec isl[])

Collective on eps

### Input Parameters

| eps | - the eigenproblem solver context
| n | - number of vectors
| isl | - set of basis vectors of the left initial space

### Notes

Left initial vectors are used to initiate the left search space in two-sided eigensolvers. Users should pass here an approximation of the left eigenspace, if available.

The same comments in EPSSetInitialSpace() are applicable here.

### See Also

EPSSetInitialSpace(), EPSSetTwoSided()

### Level

intermediate

### Location

src/eps/interface/epssetup.c

### Examples

src/eps/tutorials/ex41.c.html
Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages