MATSHELL

MATSHELL = “shell” - A matrix type to be used to define your own matrix type with its own data structure – perhaps matrix-free.

Notes

See MatCreateShell() for details on the usage of MATSHELL

PCSHELL can be used in conjunction with MATSHELL to provide a custom preconditioner appropriate for your MATSHELL. Since many standard preconditioners such as PCILU depend on having an explicit representation of the matrix entries they cannot be used directly with MATSHELL.

See Also

Matrices, Mat, MatCreateShell(), PCSHELL

Level

advanced

Location

src/mat/impls/shell/shell.c

Examples

src/ts/tutorials/ex50.c
src/snes/tutorials/ex12.c
src/tao/leastsquares/tutorials/tomography.c

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