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is_digital.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 DIGITAL = is_digital(sys)
# function DIGITAL = is_digital(sys)
# retrurn nonzero if system is digital
# exits with an error of sys is a mixed (continuous and discrete) system
# a s hodel July 1996
# SYS_INTERNAL accesses members of system structure
# checked for sampled data system (mixed)
# discrete system
sysyd = sysgetsignals(sys,"yd");
[nn,nz] = sysdimensions(sys);
cont = sum(sysyd == 0) + nn;
tsam = sysgettsam(sys);
dig = sum(sysyd != 0) + nz + tsam;
if( cont*dig != 0)
sysout(sys);
error("continuous/discrete system; use syscont, sysdisc, or c2d first");
else
DIGITAL = (tsam > 0);
endif
endfunction