Dear Albert2002,
there is no problem with deSolve and, of course, no problem with R's
modulo operator, but there are at least two errors in your model
formulation:
1.) The order of the returned derivatives must be exactly the same as
specified in the state variables. This is documented in th
I have a problem integrating the 'standard map' (
http://en.wikipedia.org/wiki/Standard_map
http://en.wikipedia.org/wiki/Standard_map ) with deSolve:
By using the modulo-operator '%%' with 2*pi in the ODEs (standardmap1), the
resulting values of P and Theta, should not be greater than 2pi. Becaus
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