dlartgs.f - Online Linux Manual PageSection : 3
Updated : Tue Nov 14 2017
Source : Version 3.8.0
Note : LAPACK

NAMEdlartgs.f

SYNOPSIS

Functions/Subroutinessubroutine dlartgs (X, Y, SIGMA, CS, SN)
DLARTGS generates a plane rotation designed to introduce a bulge in implicit QR iteration for the bidiagonal SVD problem​.

Function/Subroutine Documentation

subroutine dlartgs (double precision X, double precision Y, double precision SIGMA, double precision CS, double precision SN)DLARTGS generates a plane rotation designed to introduce a bulge in implicit QR iteration for the bidiagonal SVD problem​. Purpose: DLARTGS generates a plane rotation designed to introduce a bulge in Golub-Reinsch-style implicit QR iteration for the bidiagonal SVD problem. X and Y are the top-row entries, and SIGMA is the shift. The computed CS and SN define a plane rotation satisfying [ CS SN ] . [ X^2 - SIGMA ] = [ R ], [ -SN CS ] [ X * Y ] [ 0 ] with R nonnegative. If X^2 - SIGMA and X * Y are 0, then the rotation is by PI/2.Parameters: X X is DOUBLE PRECISION The (1,1) entry of an upper bidiagonal matrix.
Y
Y is DOUBLE PRECISION The (1,2) entry of an upper bidiagonal matrix.
SIGMA
SIGMA is DOUBLE PRECISION The shift.
CS
CS is DOUBLE PRECISION The cosine of the rotation.
SN
SN is DOUBLE PRECISION The sine of the rotation.Author: Univ​. of Tennessee Univ​. of California Berkeley Univ​. of Colorado Denver NAG Ltd​. Date: November 2017 Definition at line 92 of file dlartgs​.f​.

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