# Matrix Operations (Mat) PETSc matrices (`Mat` objects) are used to store Jacobians and other sparse matrices in PDE-based (or other) simulations. Users guide chapter: [](ch_matrices). See also [](../MatGraphOperations/index). Examples

Source files

dlregismat.c
matnull.c
matproduct.c
matreg.c
matregis.c
matrix.c

Directories

f90-custom
ftn-custom