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NDSolve changed bahaviour in version 8?
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. Michael Weyrauch