PETSc version 3.17.4
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# MatSetBlockSizesFromMats

Sets the matrix block row and column sizes to match a pair of matrices

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatSetBlockSizesFromMats(Mat mat,Mat fromRow,Mat fromCol)

Logically Collective on Mat

### Input Parameters

| mat | - the matrix
| fromRow | - matrix from which to copy row block size
| fromCol | - matrix from which to copy column block size (can be same as fromRow)

### See Also

MatCreateSeqBAIJ(), MatCreateBAIJ(), MatGetBlockSize(), MatSetBlockSizes()

### Level

developer

### Location

src/mat/interface/matrix.c

### Examples

src/ksp/ksp/tutorials/ex76.c.html
src/ksp/ksp/tutorials/ex76f.F90.html
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