tblite_lapack_geqp3::wrap_geqp3 Interface Reference

Computes the column-pivoted economy QR decomposition of a real M-by-N matrix A. More...

Public Member Functions
subroutine	wrap_sgeqp3 (amat, jpvt, qmat, rmat, info)
	Compute a single-precision column-pivoted economy QR decomposition.
subroutine	wrap_dgeqp3 (amat, jpvt, qmat, rmat, info)
	Compute a double-precision column-pivoted economy QR decomposition.

Detailed Description

Computes the column-pivoted economy QR decomposition of a real M-by-N matrix A.

A * P = Q * R

where P is the column permutation described by jpvt, Q has orthonormal columns, and R is upper trapezoidal with |R(1,1)| >= |R(2,2)| >= ... along columns selected by decreasing pivoted norm. For an M-by-N matrix, Q has dimensions M-by-min(M,N), while R has dimensions min(M,N)-by-N.

Member Function/Subroutine Documentation

wrap_dgeqp3()

subroutine tblite_lapack_geqp3::wrap_geqp3::wrap_dgeqp3	(	real(dp), dimension(:, :), intent(inout), contiguous	amat,
		integer, dimension(:), intent(out), contiguous	jpvt,
		real(dp), dimension(:, :), intent(out), contiguous	qmat,
		real(dp), dimension(:, :), intent(out), contiguous	rmat,
		integer, intent(out)	info )

Compute a double-precision column-pivoted economy QR decomposition.

Parameters

[in,out]	amat	Input matrix on entry and QR factorization storage on exit
[out]	jpvt	Permutation so column jpvt(j) of the input ends up in position j
[out]	qmat	Economy orthogonal matrix Q
[out]	rmat	Upper trapezoidal matrix R in pivoted column order
[out]	info	Error handling

wrap_sgeqp3()

subroutine tblite_lapack_geqp3::wrap_geqp3::wrap_sgeqp3	(	real(sp), dimension(:, :), intent(inout), contiguous	amat,
		integer, dimension(:), intent(out), contiguous	jpvt,
		real(sp), dimension(:, :), intent(out), contiguous	qmat,
		real(sp), dimension(:, :), intent(out), contiguous	rmat,
		integer, intent(out)	info )

Compute a single-precision column-pivoted economy QR decomposition.

Parameters

[in,out]	amat	Input matrix on entry and QR factorization storage on exit
[out]	jpvt	Permutation so column jpvt(j) of the input ends up in position j
[out]	qmat	Economy orthogonal matrix Q
[out]	rmat	Upper trapezoidal matrix R in pivoted column order
[out]	info	Error handling

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The documentation for this interface was generated from the following file:

• /home/runner/work/tblite/tblite/src/tblite/lapack/geqp3.f90