Author 
Comment/Response 
Jigoro

03/26/13 05:21am
In Response To 'Re: Re: Re: Strange NdSolve solution'  Thank you Bill very much, this helps a lot. I do notice that at these precisions, the command Abs[N[y[99]]z[99]/.s[[1]]] would give a very large discrepancy still. This maybe the result that at such large values of t, the solution to the differential equation becomes highly nonlinear, hence difficulty in approximation, but I am not sure. I tried to increase both the accuracy goal and working precision but the error is still too far from zero. I wonder how to make the error very small. Thanks.
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