MatQRFactorSymbolic#
Performs symbolic QR factorization of matrix. Call this routine after MatGetFactor()
but before calling MatQRFactorNumeric()
.
Synopsis#
#include "petscmat.h"
PetscErrorCode MatQRFactorSymbolic(Mat fact, Mat mat, IS col, const MatFactorInfo *info)
Collective on fact
Input Parameters#
fact - the factor matrix obtained with
MatGetFactor()
mat - the matrix
col - column permutation
info - options for factorization, includes
fill - expected fill as ratio of original fill.
dtcol - pivot tolerance (0 no pivot, 1 full column pivoting)
Run with the option -info to determine an optimal value to use
Most users should employ the KSP
interface for linear solvers
instead of working directly with matrix algebra routines such as this.
See, e.g., KSPCreate()
.
Developer Note#
The Fortran interface is not autogenerated as the f90
interface definition cannot be generated correctly [due to MatFactorInfo
]
See Also#
Matrix Factorization, MatGetFactor()
, MatFactorInfo
, MatQRFactor()
, MatQRFactorNumeric()
, MatLUFactor()
, MatFactorInfo
, MatFactorInfoInitialize()
Level#
developer
Location#
Implementations#
MatQRFactorSymbolic_SPQR in src/mat/impls/aij/seq/spqr/aijspqr.c
MatQRFactorSymbolic_SeqDense in src/mat/impls/dense/seq/dense.c
Index of all Mat routines
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Index of all manual pages