dlas2.f - Online Linux Manual Page

Section : 3
Updated : Tue Nov 14 2017
Source : Version 3.8.0
Note : LAPACK

NAMEdlas2.f

SYNOPSIS

Functions/Subroutinessubroutine dlas2 (F, G, H, SSMIN, SSMAX)
DLAS2 computes singular values of a 2-by-2 triangular matrix​.

Function/Subroutine Documentation

subroutine dlas2 (double precision F, double precision G, double precision H, double precision SSMIN, double precision SSMAX)DLAS2 computes singular values of a 2-by-2 triangular matrix​. Purpose: DLAS2 computes the singular values of the 2-by-2 matrix [ F G ] [ 0 H ]. On return, SSMIN is the smaller singular value and SSMAX is the larger singular value.Parameters: F F is DOUBLE PRECISION The (1,1) element of the 2-by-2 matrix.
G
G is DOUBLE PRECISION The (1,2) element of the 2-by-2 matrix.
H
H is DOUBLE PRECISION The (2,2) element of the 2-by-2 matrix.
SSMIN
SSMIN is DOUBLE PRECISION The smaller singular value.
SSMAX
SSMAX is DOUBLE PRECISION The larger singular value.Author: Univ​. of Tennessee Univ​. of California Berkeley Univ​. of Colorado Denver NAG Ltd​. Date: December 2016 Further Details: Barring over/underflow, all output quantities are correct to within a few units in the last place (ulps), even in the absence of a guard digit in addition/subtraction. In IEEE arithmetic, the code works correctly if one matrix element is infinite. Overflow will not occur unless the largest singular value itself overflows, or is within a few ulps of overflow. (On machines with partial overflow, like the Cray, overflow may occur if the largest singular value is within a factor of 2 of overflow.) Underflow is harmless if underflow is gradual. Otherwise, results may correspond to a matrix modified by perturbations of size near the underflow threshold.Definition at line 109 of file dlas2​.f​.

AuthorGenerated automatically by Doxygen for LAPACK from the source code​.
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Johanes Gumabo
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