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Re: NDSolve changed bahaviour in version 8?
On Tue, 8 Feb 2011, Michael Weyrauch wrote: > Hello, > > I am using NDSolve for the solution of large (say 10.000) > sets of coupled non-linear ordinary differential equations. > > After "upgrading" to Mathematica 8 I observe that programs, that work > well under Mathematica 6 (i.e. finish in about 3 hours) never finish > in Mathematica 8 (i.e. I stop them after about 24 hours). The code is > identical. > > Does anyone have similar experience? Does anyone know of changes > in the NDSolve codebase, e.g. step size management? Is there > any way to restore Mathematica 6 performance of NDSolve? > > Thanks for any ideas. > Hi Michael, I am aware of two issues that could *possibly* cause this. But the telediagonis is tricky, if possible at all. What - if any - options do you pass to NDSolve? In any case it were good if you could send this to tech support to investigate. Thanks. Oliver > Michael Weyrauch > >