MatStructure#
Indicates if two matrices have the same nonzero structure
Synopsis#
Values#
SAME_NONZERO_PATTERN
- the two matrices have identical nonzero patternsDIFFERENT_NONZERO_PATTERN
- the two matrices may have different nonzero patternsSUBSET_NONZERO_PATTERN
- the nonzero pattern of the second matrix is a subset of the nonzero pattern of the first matrixUNKNOWN_NONZERO_PATTERN
- there is no known relationship between the nonzero patterns. In this case the implementations may try to detect a relationship to optimize the operation
Note#
Certain matrix operations (such as MatAXPY()
) can run much faster if the sparsity pattern of the matrices are the same. But actually determining if
the patterns are the same may be costly. This provides a way for users who know something about the sparsity patterns to provide this information
to certain PETSc routines.
See Also#
Level#
beginner
Location#
Examples#
src/ksp/ksp/tutorials/ex34.c
src/tao/tutorials/ex4.c
src/ksp/ksp/tutorials/ex19.c
src/tao/pde_constrained/tutorials/hyperbolic.c
src/ksp/ksp/tutorials/ex79.c
src/ksp/ksp/tutorials/ex29.c
src/tao/unconstrained/tutorials/spectraladjointassimilation.c
src/mat/tutorials/ex9.c
Examples#
src/tao/pde_constrained/tutorials/hyperbolic.c
src/ksp/pc/tutorials/ex4.c
src/ksp/ksp/tutorials/ex76.c
Examples#
src/ksp/ksp/tutorials/ex21.c
src/ts/tutorials/ex50.c
src/ksp/ksp/tutorials/ex77.c
src/tao/pde_constrained/tutorials/hyperbolic.c
src/tao/unconstrained/tutorials/burgers_spectral.c
src/tao/pde_constrained/tutorials/elliptic.c
src/tao/pde_constrained/tutorials/parabolic.c
src/ts/tutorials/ex3.c
src/ksp/ksp/tutorials/ex76.c
Examples#
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages