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## System of ODE's - Part II

**From**: |
Dennis Bayrock |

**Subject**: |
System of ODE's - Part II |

**Date**: |
Fri, 28 Sep 2001 10:50:37 -0600 |

**User-agent**: |
Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:0.9.4) Gecko/20010913 |

Hello All!

` First off, I would like to thank everyone for their quick reply to
``my posting - it is nice to see such a fast turnaround to a help question!
`` Although everyone's input helped me and I have re-read the manual, I
``am still having problems understanding Octave's syntax in integrating
``ODE's. I am not an engineer or a mathematician but rather a fermentation
``microbiologist. Despite this shortcoming ( :) ) I can construct ODE's
``and see the value in integrating them.
`

` OK now on to my ongoing question. I see that my posting last time
``did not quite emphasize what I was trying to get help on (my fault) so I
``will try again. I will not use my model in this example but rather a
``hypothetical example so that: 1. People don't feel I am trying to elicit
``an answer from them (i.e. you doing my work), 2. I hope that someone
``will give me an explicit answer on how to actually enter the equations
``into Octave, and 3. My models are confidential.
`
The hypothetical equations are:
dX/dt = X * S * dP/dt
dS/dt = X * P * dX/dt
dP/dt = X + dS/dt + dX/dt

`Ignore initial conditions for now. Notice first that X,S, and P on the
``right side of the equations are not constants. Also some of the
``differential equations are part of (nested within) other differential
``equations. Could someone please show me how they would actually enter
``these differential equations into Octave so that it can integrate them?
``I can then apply the correct syntax from this example to my actual model.
`

`On a side note. Is there a way to symbolically enter these equations
``into Octave? If not then I would strongly suggest this to be explored
``and put into the next version of Octave so that people like me can more
``easily use it.
`
Thank's all in advance!
Dennis Bayrock, P.hD.
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**System of ODE's - Part II**,
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