Hi Robert
Thanks for your answer. Good luck with squashing the bug!
Regards
Lukas
> Lukas,
>
> I found this bug the other day - manifested differently. Worse, I
> think it is in some code that I contributed. I have no idea what is
> causing it. I did find a workaround, but will need access to my
> computer to provide that information.
>
> I am traveling right now and have limited email access and no
> computer access, but when I get home (one week from today) I will
> provide more information. I did strip the problem down to a very,
> very simple example.
>
> Bob
>
>
> Lukas Reichlin wrote:
>> 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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