Re: lsim problem

[Geraint Paul Bevan]

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Gerrit wrote:

|
| G = tf2sys([1], [2, 2, 1]);
| t = 0:.01:20;
| u = exp(-t) + sin(t*2)/5;
| [y, tt] = lsim(G, u, t); % literally taken from homework assignment
| plot(t, u, 'r', tt, y, 'b');
|
| The fourth line gives the following error message:
|
| error: lsim: There should be an input value (row) for each time instant
| error: evaluating if command near line 59, column 3
| error: called from `lsim' in file
`/usr/share/octave/2.1.50/m/control/base/lsim.m'
| error: near line 12 of file `/srv/www/studie/s_en_t/opg23.m'
|

You have defined t, and hence u, as a single row instead of a single
column. If you transpose t and u (using the ' operator), it should work.

Also, if you use a recent version of Octave, you should find that tf()
works without altering the code to use tf2sys instead.


- --
Geraint Bevan
http://homepage.ntlworld.com/geraint.bevan

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