PETSc version 3.17.4
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# MatQRFactorNumeric

Performs numeric QR factorization of a matrix. Call this routine after first calling MatQRFactorSymbolic().

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatQRFactorNumeric(Mat fact,Mat mat,const MatFactorInfo *info)

Collective on Mat

### Input Parameters

| fact | - the factor matrix obtained with MatGetFactor()
| mat | - the matrix
| info | - options for factorization

### Notes

See MatQRFactor() for in-place factorization.

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().

### See Also

MatQRFactorSymbolic(), MatLUFactor()

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

MatQRFactorNumeric_SPQR in src/mat/impls/aij/seq/spqr/aijspqr.c
MatQRFactorNumeric_SeqDense in src/mat/impls/dense/seq/dense.c
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