petsc-master 2019-11-16
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MATSEQAIJ

MATSEQAIJ = "seqaij" - A matrix type to be used for sequential sparse matrices, based on compressed sparse row format.

Options Database Keys

-mat_type seqaij -sets the matrix type to "seqaij" during a call to MatSetFromOptions()

Notes

MatSetValues() may be called for this matrix type with a NULL argument for the numerical values, in this case the values associated with the rows and columns one passes in are set to zero in the matrix

MatSetOptions(,MAT_STRUCTURE_ONLY,PETSC_TRUE) may be called for this matrix type. In this no space is allocated for the nonzero entries and any entries passed with MatSetValues() are ignored

Developer Notes

It would be nice if all matrix formats supported passing NULL in for the numerical values

See Also

MatCreateSeqAIJ(), MatSetFromOptions(), MatSetType(), MatCreate(), MatType

Level

beginner

Location

src/mat/impls/aij/seq/aij.c

Examples

src/mat/examples/tutorials/ex1.c.html
src/mat/examples/tutorials/ex12.c.html
src/ksp/ksp/examples/tutorials/ex59.c.html
src/tao/leastsquares/examples/tutorials/tomography.c.html

Index of all Mat routines
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Index of all manual pages