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. 0
Johanes Gumabo
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