Using a divide and conquer approach, LASD0: computes the singular value decomposition (SVD) of a real upper bidiagonal N-by-M matrix B with diagonal D and offdiagonal E, where M = N + SQRE. The algorithm computes orthogonal matrices U and VT such that B = U * S * VT. The singular values S are overwritten on D. A related subroutine, DLASDA, computes only the singular values, and optionally, the singular vectors in compact form. More...

Public Member Functions
pure subroutine	dlasd0 (n, sqre, d, e, u, ldu, vt, ldvt, smlsiz, iwork, work, info)

	la_dlasd0

	la_qlasd0

pure subroutine	slasd0 (n, sqre, d, e, u, ldu, vt, ldvt, smlsiz, iwork, work, info)

	la_slasd0

Detailed Description

Using a divide and conquer approach, LASD0: computes the singular value decomposition (SVD) of a real upper bidiagonal N-by-M matrix B with diagonal D and offdiagonal E, where M = N + SQRE. The algorithm computes orthogonal matrices U and VT such that B = U * S * VT. The singular values S are overwritten on D. A related subroutine, DLASDA, computes only the singular values, and optionally, the singular vectors in compact form.

Member Function/Subroutine Documentation

◆ dlasd0()

pure subroutine la_lapack::lasd0::dlasd0	(	integer(ilp), intent(in)	n,
		integer(ilp), intent(in)	sqre,
		real(dp), dimension(*), intent(inout)	d,
		real(dp), dimension(*), intent(inout)	e,
		real(dp), dimension(ldu,*), intent(out)	u,
		integer(ilp), intent(in)	ldu,
		real(dp), dimension(ldvt,*), intent(out)	vt,
		integer(ilp), intent(in)	ldvt,
		integer(ilp), intent(in)	smlsiz,
		integer(ilp), dimension(*), intent(out)	iwork,
		real(dp), dimension(*), intent(out)	work,
		integer(ilp), intent(out)	info
	)

◆ la_dlasd0()

la_lapack::lasd0::la_dlasd0

◆ la_qlasd0()

la_lapack::lasd0::la_qlasd0

◆ la_slasd0()

la_lapack::lasd0::la_slasd0

◆ slasd0()

pure subroutine la_lapack::lasd0::slasd0	(	integer(ilp), intent(in)	n,
		integer(ilp), intent(in)	sqre,
		real(sp), dimension(*), intent(inout)	d,
		real(sp), dimension(*), intent(inout)	e,
		real(sp), dimension(ldu,*), intent(out)	u,
		integer(ilp), intent(in)	ldu,
		real(sp), dimension(ldvt,*), intent(out)	vt,
		integer(ilp), intent(in)	ldvt,
		integer(ilp), intent(in)	smlsiz,
		integer(ilp), dimension(*), intent(out)	iwork,
		real(sp), dimension(*), intent(out)	work,
		integer(ilp), intent(out)	info
	)

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

la_lapack.f90