Friday, 15 May 2015

python - Scipy ODE integration using dopri5 method -


I get an error when solving the coupled differential equation and I do not get it because I am new in Python.

"Dupree 5: Step size becomes very small messages (idid, 'unexpected idid =% s'% idid))

" Please tell me about the OD Antileter Help me with the proper explanation in 

 gt: solver.integrate (current_t, step = 1) i + = 1 z = solver.y if i

I do not know how to solve it, especially since skillful has no viable method ...

Also known as Dupri 5 or RK45 Is a run-cut method that mixes order-4 and order -5 method. Order -5 method is used as a proxy for exact value to estimate the error of order-5 method if the error is not relative to the phase-size and problem scale in the pre-defined range, then the step-size Is reduced or extended. This allows for integration to match some predefined global error to the least effort.

In the rigid system it may be that reduction in step-size is never successful in running an error in the acceptable area. There are probably some unsuccessful -rereases, so that this bad behavior can be found on an important part of the integration interval, invalidating all error estimates.

Using the built-in methods to solve the rigid system integration, as the notation methods

I did not find an indication
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