MatQRFactor#
Performs in-place QR factorization of matrix.
Synopsis#
#include "petscmat.h"
PetscErrorCode MatQRFactor(Mat mat, IS col, const MatFactorInfo *info)
Collective
Input Parameters#
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
Notes#
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().
This changes the state of the matrix to a factored matrix; it cannot be used
for example with MatSetValues() unless one first calls MatSetUnfactored().
Fortran Note#
A valid (non-null) info argument must be provided
See Also#
Matrices, Mat, Matrix Factorization, MatFactorInfo, MatGetFactor(), MatQRFactorSymbolic(), MatQRFactorNumeric(), MatLUFactor(),
MatSetUnfactored()
Level#
developer
Location#
Implementations#
MatQRFactor_SeqDense() in src/mat/impls/dense/seq/dense.c
Index of all Mat routines
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Index of all manual pages