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Rafael López
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&[Wolfram Notebook][1] [1]: https://www.wolframcloud.com/obj/25c400dd-4c27-46ec-ad41-a0b01f8a45f5
I want to solve an ODE when it appears an Interpolating Function. First I obtain the function y[s] (or Y[s]) aa = .4; sol = NDSolve[{-4 + 4/y[s]^2 - y[s]^2 + y[s]^4 + y'[s]^2 == 0, y[0] == 1.207}, y[s], {s, 0, aa}]; ParametricPlot...