Re: how can I plot an arbitrary function passed through a transfer function?

[Doug Stewart]

On Tue, Nov 2, 2010 at 11:35 AM, Matthias Lang <address@hidden> wrote:
> Hi,
>
> I can define a transfer function like this:
>
>  octave:13> L = tf([9.2404e-8, 7.9861e-1, 1.6049e6], [3.8307e-14, 4.575e-7, 
> 1.7223, 2.1612e6]);
>
> and then I can plot the step response like this:
>
>  octave:15> step(L)
>
> which is a good start.
>
> But what I really want to do is plot an arbitrary function (made up of
> a few steps and ramps) after it's passed through my transfer function.
>
> Can I do that in octave? A nudge in the right direction would be nice.
>
> Looking through the mailing list archives, I've found this:
>
>  https://www-old.cae.wisc.edu/pipermail/help-octave/2006-December/002440.html
>
> which seems promising. I'm new to octave, so this may be a dumb
> question.
>
> Matt
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>

Think of your system as a filter, then define the input to this filter
in any way you want.

Use the filter.m function.

help filter

You can pad the front end and back end of your input signal with some zeros etc.

HTH
Doug Stewart