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Re: plotting transfer function in octave 5.2: How to fix error: set: "da

From: Doug Stewart
Subject: Re: plotting transfer function in octave 5.2: How to fix error: set: "dataaspectratio' must be finite
Date: Fri, 31 Jul 2020 16:07:17 -0400

On Fri, Jul 31, 2020 at 3:28 PM shall689 <> wrote:

I am using Octave 5.2 and control pkg 3.2.0.  When I try to plot the step
response of a transfer funciton, octave is returning error: set:
"dataaspectratio' must be finite.  It also returns "warning:
opengl_renderer: data values greater than float capacity. (1) scale data, or
(2) use gnuplot.

The octave I am using only has two available graphics toolkits: qt and fltk.
graphic_toolkit() returns qt.

What is the best way to fix this issue? 

I don't have Octave on the computer that I am using to type this message, so
I don't have the exact transfer function, so I manually copied the transfer
function (shown below).



The first problem is that  6.25e-18*s^8 is approximately 0
6.25e-18 is so small.

The 2nd point is:

In control theory there are dominant poles and zeros and non dominant ones.
I would suggest that you disregard the poles that are far away from the origin.

DASCertificate for 206392

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