stuartmelvin

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3 years, 268 days

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I am trying to solve and plot a diff. eq. with two initial condtions and keep getting the same error.

F1 := diff(x(t), `$`(t, 2))+omega^2*sin(x(t)) = 0;

g := 9.8; L := 1; omega := g/L;

sol := dsolve({F1, D(x)*0 = 0, x(0) = (1/2)*pi}, x(t), numeric);
Error, (in dsolve/numeric/process_input) invalid specification of initial conditions, got 0 = 0

 any help or suggestions would be appreciated

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