petsc-3.14.5 2021-03-03
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# MatGetSize

Returns the numbers of rows and columns in a matrix.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatGetSize(Mat mat,PetscInt *m,PetscInt *n)

Not Collective

### Input Parameter

| mat | - the matrix

### Output Parameters

| m | - the number of global rows
| n | - the number of global columns

Note: both output parameters can be NULL on input.

### See Also

MatGetLocalSize()

### Level

beginner

### Location

src/mat/interface/matrix.c

### Examples

src/mat/tutorials/ex4.c.html
src/mat/tutorials/ex10.c.html
src/mat/tutorials/ex12.c.html
src/mat/tutorials/ex16.c.html
src/mat/tutorials/ex17.c.html
src/mat/tutorials/ex4f.F90.html
src/mat/tutorials/ex17f.F90.html
src/ksp/ksp/tutorials/ex4.c.html
src/ksp/ksp/tutorials/ex59.c.html
src/ksp/ksp/tutorials/ex72.c.html
src/ksp/ksp/tutorials/ex73.c.html
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages