> From: [email protected]
> Date: Tue, 10 Nov 2009 09:41:52 +0100
> To: [email protected]; [email protected]
> Subject: [OctDev] Bugs in control/tzero function (was Re: Discrete feedback
> loop)
>
> I made some further investigations (I'm writing pzmap.m for control-oo at the
> moment, which needs to compute the zeros of a system) and came to the
> conclusion that tzero.m from the control package is buggy. The attachment
> contains an example where the discrepancy of the results is big: Matlab gets
> -13.2759, -0.0155, 12.5774, while tzero gets -5.708333, -0.015561, 31.509741.
> Apparently the bug has been undiscovered for about 15 (!) years.
>
> The bad thing is that I reused the code from tzero.m in the control-oo
> package ...
>
> Regards,
> Lukas
>
>
Hi Lukas.
try using tzero2, it works for me on your example. What the difference is I
don't know.
Doug Stewart
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