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## LSODE: Outputting Non-integrated States

**From**: |
Travis |

**Subject**: |
LSODE: Outputting Non-integrated States |

**Date**: |
Mon, 2 Jun 2003 09:13:32 -0500 |

**User-agent**: |
KMail/1.5 |

Is it possible for LSODE to output data for states other than the 'dy' values?
For example:
I am working on a dynamic simulation of a hydraulic system with flow rates and
pressures. The 'dy' values are all pressures, but in order to calculate
them, you need to calculate the flow rates as an intermediate step. Since the
equation to get flow rate from pressure difference isn't a differential
equation, it isn't output by LSODE.
I'm interested in the flows, not pressures. Since the integration routine
calculates these flows as intermediate values (which I can't access), I'm
having to duplicate the calculation when I post-process the pressures to get
flows. Any ideas of how to output these flows directly from LSODE to avoid
the redundant calculations?
I hope I've explained my problem clearly.
Travis Wiens
University of Saskatchewan
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**LSODE: Outputting Non-integrated States**,
*Travis* **<=**