[python-control-discuss] ODE integrator problems

[Sawyer F. <mi...@se...>]

Is anybody experiencing terrible performance of the integrator, used in
functions like "step_response"? I see glitches and other random behavior
when running my own code, and even for example the pvtol-nested.py example
code. The integrator it uses, scipy.integrate.odeint, is derived from some
fortran code somewhere and  appears to be doing optimization that is giving
unwanted behavior.

One can force a short simulation interval dt for a fixed-step integration
by passing "hmax=dt" to "step-respose" and get a response that looks like
Matlab's, but I'd rather just have a working integrator that optimizes
correctly.

Anybody know a good workaround, eg settings for the integrator that make it
behave normally? Or why it is giving odd behavior?

S


------------------------
Sawyer B. Fuller, Ph.D.
Harvard School of Engineering and Applied Science
Wyss Institute for Biologically Inspired Engineering
http://people.seas.harvard.edu/~minster/