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impulse.m
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1999-03-05
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# Copyright (C) 1996 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 [y, t] = impulse(sys, inp, tstop, n)
# step: Impulse response for a linear system.
# The system can be discrete or multivariable (or both).
#
# [y, t] = impulse(sys[, inp, tstop, n])
# Produces a plot or the step response data for system sys.
#
# The argument tstop (scalar value) denotes the time when the
# simulation should end. The Parameter n is the number of data values.
# Both parameters tstop and n can be ommitted and will be
# computed from the eigenvalues of the A-Matrix.
#
# When the step function is invoked with the output parameter y
# a plot is not displayed.
#
# See also: step, stepimp
# Written by Kai P. Mueller October 2, 1997
# based on lsim.m of Scottedward Hodel
# modified by
if((nargin < 1) || (nargin > 4))
usage("[y, u] = impulse(sys[, inp, tstop, n])");
endif
if(nargout > 2)
usage("[y, u] = impulse(sys[, inp, tstop, n])");
endif
if(!is_struct(sys))
error("impulse: sys must be a system data structure.");
endif
if (nargout == 0)
switch (nargin)
case (1)
stepimp(2, sys);
case (2)
stepimp(2, sys, inp);
case (3)
stepimp(2, sys, inp, tstop);
case (4)
stepimp(2, sys, inp, tstop, n);
endswitch
else
switch (nargin)
case (1)
[y, t] = stepimp(2, sys);
case (2)
[y, t] = stepimp(2, sys, inp);
case (3)
[y, t] = stepimp(2, sys, inp, tstop);
case (4)
[y, t] = stepimp(2, sys, inp, tstop, n);
endswitch
endif
endfunction