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wgt1o.m
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1999-04-29
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# Copyright (C) 1998 Kai P. Mueller
#
# 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 wsys = wgt1o(vl, vh, fc)
# wgt10 State space description of a first order weighting function.
#
# wsys = wgt1o(vl, vh, fc)
#
# Weighting function are needed by the H2/H_infinity design procedure.
# These function are part of thye augmented plant P (see hinfdemo
# for an applicattion example).
#
# vl = Gain @ low frequencies
# vh = Gain @ high frequencies
# fc = Corner frequency (in Hz, *not* in rad/sec)
# Written by Kai P. Mueller September 30, 1997
if (nargin != 3)
usage("wsys = wgt1o(vl, vh, fc)");
endif
if(nargout > 1)
usage("wsys = wgt1o(vl, vh, fc)");
endif
if (vl == vh)
a = [];
b = [];
c = [];
else
a = [-2*pi*fc];
b = [-2*pi*fc];
c = [vh-vl];
endif
d=[vh];
wsys = ss2sys(a,b,c,d);
endfunction