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The number of intervals (100 in your case) must be greater or equal than the length of the interval to be solved for (1000-0=1000 in your case).
I think you wanted to see the solution up to 100 with 1000 intervals:

The number of intervals (100 in your case) must be greater or equal than the length of the interval to be solved for (1000-0=1000 in your case).
I think you wanted to see the solution up to 100 with 1000 intervals:

may ı real simulate this work with moving things
