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## Re: Derivative function

 From: Henry F. Mollet Subject: Re: Derivative function Date: Wed, 19 Feb 2003 10:45:27 -0800 User-agent: Microsoft-Entourage/10.1.1.2418

```I have just looked at the lecture notes by A. Scottedward Hodel on
Introductory Controls Using the Octave Control Systems Toolbox. The example
of the damped mass-spring system on p. 19/20 is implemented, among other
code with the following code line:
: pos-x'' = (1.0/mass) * (......... - pos_x) - alpha*pos_x'
Where pos_x and first and second derivative of pos_x appear.

Question: Is the Octave Control Systems Toolbox different from Octave and
can it be considered a symbolic math package?

Question: if pos_x' is the derivative, how is it distinguished from the
complex conjugate transpose operator " ' "? (Transpose operator is " .' "
Henry
N.B. The analysis of Life Cycle Graphs is simplified by the use of the
z-transform. Of course, what's considered "stable" in electrical circuits
(all eigenvalues inside the unit circle in the complex plane, means species
extinction in the animal or plant kingdom.

on 2/19/03 6:50 AM, Miquel Cabanas at address@hidden wrote:

> hi,
>
> On Wed, Feb 19, 2003 at 03:37:56PM +0100, Ricardo Cervera wrote:
>>
>> I wanted to know if it is possible to get the derivative
>> function of a function given, using Octave. I mean, something
>> like:
>>
>> function y = f(x)
>> y = sin(x);
>> endfunction
>>
>> And what I am looking for is f'(x), for example cos(x).
>
> you're looking for a symbolic maths package like Maxima or
> Yacas. A good starting point is the Scientific Applications
> for Linux website at,
>
> http://sal.kachinatech.com/
>
> Miquel

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