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# MatCreateSeqDense

Creates a `MATSEQDENSE` that is stored in column major order (the usual Fortran format).

## Synopsis

    #include "petscmat.h"
    PetscErrorCode MatCreateSeqDense(MPI_Comm comm, PetscInt m, PetscInt n, PetscScalar data[], Mat *A)

Collective

## Input Parameters

- comm - MPI communicator, set to `PETSC_COMM_SELF`

- m - number of rows

- n - number of columns

- data - optional location of matrix data in column major order. Use `NULL` for PETSc to control all matrix memory allocation.

## Output Parameter

- A - the matrix

## Note

The data input variable is intended primarily for Fortran programmers who wish to allocate their own matrix memory space. Most users should set `data` = `NULL`.

## Developer Note

Many of the matrix operations for this variant use the BLAS and LAPACK routines.

## See Also

Matrices, `Mat`, `MATSEQDENSE`, `MatCreate()`, `MatCreateDense()`, `MatSetValues()`

## Level

intermediate

## Location

src/mat/impls/dense/seq/dense.c

## Examples

src/ts/tutorials/extchem.c
src/ksp/ksp/tutorials/ex68.c
src/tao/leastsquares/tutorials/cs1.c
src/ksp/ksp/tutorials/ex74.c
src/ts/tutorials/ex43.c
src/tao/leastsquares/tutorials/chwirut1.c

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages