Hi! i'm solving an equation sol = NDSolve[{y''[t] + Sin[y[t]] == Sin[t], y[0] == 0, y'[0] == 0}, y, {t, 0, 5}] Plot[Evaluate[y[t] /. sol], {t, 0, 5}] I do not know how to plot y'[t] vs. y[t]. Any help appreciated!
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Try this: Clear[y] sol = NDSolve[{y''[t] + Sin[y[t]] == Sin[t], y[0] == 0, y'[0] == 0}, y, {t, 0, 5}] y[t_] = First[Evaluate[y[t] /. sol]] yd[t_] = D[y[t], t] ParametricPlot[{yd[t], y[t]}, {t, 0, 5}]
Amazing!!! You are genius. Thank you !!!
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