PETSc version 3.17.4
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# MatComputeOperator

Computes the explicit matrix

### Synopsis

    #include "petscmat.h"
    PetscErrorCode  MatComputeOperator(Mat inmat,MatType mattype,Mat *mat)

Collective on Mat

### Input Parameters

| inmat | - the matrix
| mattype | - the matrix type for the explicit operator

### Output Parameter

| mat | - the explicit operator

### Notes

This computation is done by applying the operators to columns of the identity matrix. This routine is costly in general, and is recommended for use only with relatively small systems. Currently, this routine uses a dense matrix format if mattype == NULL.

### Level

advanced

### Location

src/mat/utils/axpy.c

### Examples

src/ksp/ksp/tutorials/ex4.c.html
src/ksp/ksp/tutorials/ex21.c.html
src/ksp/ksp/tutorials/ex34.c.html
Index of all Mat routines
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Index of all manual pages