slepc-3.18.1 2022-11-02
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# STShellSetApply

Sets routine to use as the application of the operator to a vector in the user-defined spectral transformation.

### Synopsis

    #include "slepcst.h"
    PetscErrorCode STShellSetApply(ST st,PetscErrorCode (*apply)(ST,Vec,Vec))

Logically Collective on st

### Input Parameters

| st | - the spectral transformation context
| apply | - the application-provided transformation routine

### Calling sequence of apply

     PetscErrorCode apply(ST st,Vec xin,Vec xout)

| st | - the spectral transformation context
| xin | - input vector
| xout | - output vector

### See Also

STShellSetBackTransform(), STShellSetApplyTranspose()

### Level

advanced

### Location

src/sys/classes/st/impls/shell/shell.c

### Examples

src/eps/tutorials/ex10.c.html
src/eps/tutorials/ex10f90.F90.html
src/eps/tutorials/ex35.c.html
src/eps/tutorials/ex36.c.html
Index of all ST routines
Table of Contents for all manual pages
Index of all manual pages