LASQ1: computes the singular values of a real N-by-N bidiagonal matrix with diagonal D and off-diagonal E. The singular values are computed to high relative accuracy, in the absence of denormalization, underflow and overflow. The algorithm was first presented in "Accurate singular values and differential qd algorithms" by K. V. Fernando and B. N. Parlett, Numer. Math., Vol-67, No. 2, pp. 191-230, 1994, and the present implementation is described in "An implementation of the dqds Algorithm (Positive Case)", LAPACK Working Note. More...

Public Member Functions
pure subroutine	dlasq1 (n, d, e, work, info)

	la_dlasq1

	la_qlasq1

pure subroutine	slasq1 (n, d, e, work, info)

	la_slasq1

Detailed Description

LASQ1: computes the singular values of a real N-by-N bidiagonal matrix with diagonal D and off-diagonal E. The singular values are computed to high relative accuracy, in the absence of denormalization, underflow and overflow. The algorithm was first presented in "Accurate singular values and differential qd algorithms" by K. V. Fernando and B. N. Parlett, Numer. Math., Vol-67, No. 2, pp. 191-230, 1994, and the present implementation is described in "An implementation of the dqds Algorithm (Positive Case)", LAPACK Working Note.

Member Function/Subroutine Documentation

◆ dlasq1()

pure subroutine la_lapack::lasq1::dlasq1	(	integer(ilp), intent(in)	n,
		real(dp), dimension(*), intent(inout)	d,
		real(dp), dimension(*), intent(inout)	e,
		real(dp), dimension(*), intent(out)	work,
		integer(ilp), intent(out)	info
	)

◆ la_dlasq1()

la_lapack::lasq1::la_dlasq1

◆ la_qlasq1()

la_lapack::lasq1::la_qlasq1

◆ la_slasq1()

la_lapack::lasq1::la_slasq1

◆ slasq1()

pure subroutine la_lapack::lasq1::slasq1	(	integer(ilp), intent(in)	n,
		real(sp), dimension(*), intent(inout)	d,
		real(sp), dimension(*), intent(inout)	e,
		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