PETSc version 3.15.5
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# MatCreateSubMatrixFree

Creates a reduced matrix by masking a full matrix.

### Synopsis

    #include "petsctao.h"
    #include "submatfree.h"
    PetscErrorCode MatCreateSubMatrixFree(Mat mat,IS Rows, IS Cols, Mat *J)

Collective on matrix

### Input Parameters

| mat | - matrix of arbitrary type
| Rows | - the rows that will be in the submatrix
| Cols | - the columns that will be in the submatrix

### Output Parameters

| J | - New matrix

### Notes

The caller is responsible for destroying the input objects after matrix J has been destroyed.

### See Also

MatCreate()

### Level

developer

### Location

src/tao/matrix/submatfree.c
Index of all Tao routines
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Index of all manual pages