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step.m
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1999-12-24
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## Copyright (C) 1996 Auburn University. All Rights Reserved.
##
## 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
## -*- texinfo -*-
## @deftypefn {Function File } {[@var{y}, @var{t}] =} impulse (@var{sys}@{, @var{inp},@var{tstop}, @var{n}@})
## Step response for a linear system.
## The system can be discrete or multivariable (or both).
## If no output arguments are specified, @code{impulse}
## produces a plot or the step response data for system @var{sys}.
##
## @strong{Inputs}
## @table @var
## @item sys
## System data structure.
## @item inp
## Index of input being excited
## @item tstop
## The argument @var{tstop} (scalar value) denotes the time when the
## simulation should end.
## @item n
## the number of data values.
##
## Both parameters @var{tstop} and @var{n} can be omitted and will be
## computed from the eigenvalues of the A-Matrix.
## @end table
## @strong{Outputs}
## @var{y}, @var{t}: impulse response
##
## When invoked with the output paramter y the plot is not displayed.
## @end deftypefn
## See also: impulse, stepimp
## step: Step response for a linear system.
## The system can be discrete or multivariable (or both).
##
## [y, t] = step(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: impulse, stepimp
function [y, t] = step (sys, inp, tstop, n)
## Written by Kai P. Mueller September 30, 1997
## based on lsim.m of Scottedward Hodel
## modified by
if((nargin < 1) || (nargin > 4))
usage("[y, u] = step(sys[, inp, tstop, n])");
endif
if(nargout > 2)
usage("[y, u] = step(sys[, inp, tstop, n])");
endif
if(!is_struct(sys))
error("step: sys must be a system data structure.");
endif
if (nargout == 0)
switch (nargin)
case (1)
stepimp(1, sys);
case (2)
stepimp(1, sys, inp);
case (3)
stepimp(1, sys, inp, tstop);
case (4)
stepimp(1, sys, inp, tstop, n);
endswitch
else
switch (nargin)
case (1)
[y, t] = stepimp(1, sys);
case (2)
[y, t] = stepimp(1, sys, inp);
case (3)
[y, t] = stepimp(1, sys, inp, tstop);
case (4)
[y, t] = stepimp(1, sys, inp, tstop, n);
endswitch
endif
endfunction