MatFactorShiftType#

Type of numeric shift used for factorizations

Synopsis#

typedef enum {
  MAT_SHIFT_NONE,
  MAT_SHIFT_NONZERO,
  MAT_SHIFT_POSITIVE_DEFINITE,
  MAT_SHIFT_INBLOCKS
} MatFactorShiftType;

Values#

MAT_SHIFT_NONE - do not shift the matrix diagonal entries
MAT_SHIFT_NONZERO - shift the entries to be non-zero
MAT_SHIFT_POSITIVE_DEFINITE - shift the entries to force the factorization to be positive definite
MAT_SHIFT_INBLOCKS - only shift the factors inside the small dense diagonal blocks of the matrix, for example with MATBAIJ

See Also#

Matrices, Mat, MatGetFactor(), PCFactorSetShiftType()

Level#

intermediate

Location#

include/petscmat.h

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages