petsc-3.7.7 2017-09-25

MatCreate

Creates a matrix where the type is determined from either a call to MatSetType() or from the options database with a call to MatSetFromOptions(). The default matrix type is AIJ, using the routines MatCreateSeqAIJ() or MatCreateAIJ() if you do not set a type in the options database. If you never call MatSetType() or MatSetFromOptions() it will generate an error when you try to use the matrix.

Synopsis

#include "petscmat.h"  
PetscErrorCode  MatCreate(MPI_Comm comm,Mat *A)

Collective on MPI_Comm

Input Parameter

comm -MPI communicator

Output Parameter

A -the matrix

Options Database Keys

	-mat_type seqaij	- AIJ type, uses MatCreateSeqAIJ()
	-mat_type mpiaij	- AIJ type, uses MatCreateAIJ()
	-mat_type seqdense	- dense type, uses MatCreateSeqDense()
	-mat_type mpidense	- dense type, uses MatCreateDense()
	-mat_type seqbaij	- block AIJ type, uses MatCreateSeqBAIJ()
	-mat_type mpibaij	- block AIJ type, uses MatCreateBAIJ()

Even More Options Database Keys

See the manpages for particular formats (e.g., MatCreateSeqAIJ()) for additional format-specific options.

Notes

User manual sections

Keywords

matrix, create

Examples

src/mat/examples/tutorials/ex1.c.html
src/mat/examples/tutorials/ex2.c.html
src/mat/examples/tutorials/ex4.c.html
src/mat/examples/tutorials/ex5.c.html
src/mat/examples/tutorials/ex8.c.html
src/mat/examples/tutorials/ex9.c.html
src/mat/examples/tutorials/ex10.c.html
src/mat/examples/tutorials/ex12.c.html
src/mat/examples/tutorials/ex15.c.html
src/mat/examples/tutorials/ex16.c.html
src/mat/examples/tutorials/ex17.c.html

Section 3.1 Creating and Assembling Matrices

- - Chapter 3 Matrices