la_lapack::laqr1 Interface Reference

Given a 2-by-2 or 3-by-3 matrix H, LAQR1: sets v to a scalar multiple of the first column of the product (*) K = (H - s1*I)*(H - s2*I) scaling to avoid overflows and most underflows. This is useful for starting double implicit shift bulges in the QR algorithm. More...

Public Member Functions
	la_claqr1
	la_dlaqr1
	la_qlaqr1
	la_slaqr1
	la_wlaqr1
	la_zlaqr1

Detailed Description

Given a 2-by-2 or 3-by-3 matrix H, LAQR1: sets v to a scalar multiple of the first column of the product (*) K = (H - s1*I)*(H - s2*I) scaling to avoid overflows and most underflows. This is useful for starting double implicit shift bulges in the QR algorithm.

Member Function/Subroutine Documentation

la_claqr1()

la_lapack::laqr1::la_claqr1

la_dlaqr1()

la_lapack::laqr1::la_dlaqr1

la_qlaqr1()

la_lapack::laqr1::la_qlaqr1

la_slaqr1()

la_lapack::laqr1::la_slaqr1

la_wlaqr1()

la_lapack::laqr1::la_wlaqr1

la_zlaqr1()

la_lapack::laqr1::la_zlaqr1

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

• la_lapack.F90