I modified my example below to make the bug obvious. It's really a
nasty bug ;-) Somehow the objects are not properly "encapsulated",
i.e. there is some kind of partial "passing by reference". I'm using
Octave.app 3.2.3 on a recent MacBookPro with Intel Core2Duo and MacOSX
10.6.1.
Regards,
Lukas
clear all;
close all;
clc;
% script needs control-oo installed, not the "legacy" control package
s = tf ('s'); % this is a simple control-oo-only feature
% create a simple, continuous-time model
syscont = ss (-1, 1, 1, 0);
% make a copy of sysc (!) just to be sure that c2d has
% no influence on syscont (but it has)
syscopy = syscont
% now convert syscopy to discrete-time and save as sysdisc
sysdisc = c2d (syscopy, 2)
% syscont should stay continuous-time (what else?),
% but it is discrete-time now as well!
syscont
% Note that matrices a and b are unaltered in syscont (which is right),
% only sampling time changed to 2 seconds (which is obviously WRONG!).
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