Re: Error exploring a Matlab example

[vathomas]

Hi JMB,

Pade function is not implemented, but you can do the approximation yourself.
There are tables on the internet providing the coefficients, for example
here: http://en.wikipedia.org/wiki/Pad%C3%A9_table

Another way is to use the "pade" function from the development branch of
control package:
https://bitbucket.org/paramaniac/control-time-delay/src/f631625ecbd537ed3b0ef30d770a8126e13d3446/inst/pade.m?at=default

Please be advised, calling the function with an LTI (like ss, or tf) as
input argument, will error out for sure. But using the function as:
>> [num, den] = pade(theta, N)
>> Gp = tf(num,den)/(1+tau*s)
where N is the order of the approximation, should do the job.

Also if you want how good the approximation is just type
>> pade(theta, N)
and a comparison plot should appear.

Best,
Thomas



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