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## Re: Derivative function

**From**: |
Miquel Cabanas |

**Subject**: |
Re: Derivative function |

**Date**: |
Wed, 19 Feb 2003 19:55:36 +0100 |

**User-agent**: |
Mutt/1.3.28i |

hi,
On Wed, Feb 19, 2003 at 10:45:27AM -0800, Henry F. Mollet wrote:
>* 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.*
this code is for the MARSYAS software briefly described at the end
of p. 14 in his lecture notes.
>* Question: Is the Octave Control Systems Toolbox different from Octave and*
>* can it be considered a symbolic math package?*
no, i don't think so
>* Question: if pos_x' is the derivative, how is it distinguished from the*
>* complex conjugate transpose operator " ' "? (Transpose operator is " .' "*
the "'" is (presumably) interpreted as a derivative by MARSYAS, while
the same operand is a complex conjugate transpose for Octave
Miquel
--
Miquel E Cabanas ------------------------------------------------------
SeRMN, Universitat Autonoma de Barcelona (address@hidden)
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