petsc-3.14.6 2021-03-30
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MATKAIJ

 MATKAIJ = "kaij" - A matrix type to be used to evaluate matrices of form [I \otimes S + A \otimes T], where S is a dense (p \times q) matrix, T is a dense (p \times q) matrix, A is an AIJ (n \times n) matrix, and I is the identity matrix. The resulting matrix is (np \times nq). S and T are always stored independently on all processes as PetscScalar arrays in column-major format.

Notes

A linear system with multiple right-hand sides, AX = B, can be expressed in the KAIJ-friendly form of (A \otimes I) x = b, where x and b are column vectors containing the row-major representations of X and B.

See Also

MatKAIJSetAIJ(), MatKAIJSetS(), MatKAIJSetT(), MatKAIJGetAIJ(), MatKAIJGetS(), MatKAIJGetT(), MatCreateKAIJ()

Level

advanced

Location

src/mat/impls/kaij/kaij.c

Examples

src/ksp/ksp/tutorials/ex74.c.html
src/ksp/ksp/tutorials/ex77.c.html

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