Re: Speed of lsim

[Geraint Paul Bevan]

I've run the same test a couple of times on the same machine with Octave
versions 2.1.35 and 2.1.50. The newer version of Octave is much faster,
which seems to agree with the previous results.

Best advice is probably to upgrade to version 2.1.50.




Octave 2.1.35:

octave:1> sys = tf2sys(1, [1,1]);
octave:2> t = linspace(0,10,1001)';
octave:3> u = ones(1001,1);
octave:4> tic; lsim(sys,u,t); toc
ans = 24.715

and again:
ans = 26.644



Octave 2.1.50:

octave:1> sys = tf2sys(1, [1,1]);
octave:2> t = linspace(0,10,1001)';
octave:3> u = ones(1001,1);
octave:4> tic; lsim(sys,u,t); toc
ans = 0.45955


--
Geraint Bevan
Department of Mechanical Engineering
University of Glasgow
Tel: +44 (0)141 330 5917



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