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zgsgiv.m
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1999-03-05
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# Copyright (C) 1996,1998 A. Scottedward Hodel
#
# This file is part of Octave.
#
# Octave is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version.
#
# Octave is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License
# along with Octave; see the file COPYING. If not, write to the Free
# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
function [a,b] = zgsgiv(c,s,a,b)
# [a,b] = zgsgiv(c,s,a,b)
# apply givens rotation c,s to row vectors a,b
# No longer used in zero-balancing (zgpbal); kept for backward compatibility
# A. S. Hodel July 29, 1992
# Convertion to Octave by R. Bruce Tenison July 3, 1994
t1 = c*a + s*b;
t2 = -s*a + c*b;
a = t1;
b = t2;
endfunction