Hello again.(adsbygoogle = window.adsbygoogle || []).push({});

I have a solution for a simple differenttial eqn. "Simpletreb=First@NDSolve[{phi''[t] == -d

Sin[phi[t]], phi[0] == (3π/4), phi'[0] == 0}, phi[t], {t, 0, 1}]"

After some plots and other calculations i need to find the value for phi at t=0.224511 so i input "phi[0.224511]/.simpletreb" but this just outputs "phi[0.224511]". I've also tried "Evaluate[phi[0.224511]/.simpletreb" with no joy.

My .nb file is here: (you have to cut and paste the link i'm afraid) "http://bruce1711.150m.com/simple trebuchet (first) final.nb"

Any ideas anyone???

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# Another mathematica problem

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