PETSc version 3.17.0
MatQRFactor
Performs in-place QR factorization of matrix.
Synopsis
#include "petscmat.h"
PetscErrorCode MatQRFactor(Mat mat, IS col, const MatFactorInfo *info)
Collective on Mat
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 simplified 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().
See Also
MatQRFactorSymbolic(), MatQRFactorNumeric(), MatLUFactor(),
MatSetUnfactored(), MatFactorInfo, MatGetFactor()
Developer Note: fortran interface is not autogenerated as the f90
interface definition cannot be generated correctly [due to MatFactorInfo]
Level
developer
Location
src/mat/interface/matrix.c
Implementations
MatQRFactor_SeqDenseCUDA in src/mat/impls/dense/seq/cuda/densecuda.cu
MatQRFactor_SeqDense in src/mat/impls/dense/seq/dense.c
Index of all Mat routines
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Index of all manual pages