I have solved an ODE with NDSolve, and put the result in S:
S = NDSolve[{y'[x]==(y[x]^4+y[x]+1)^(1/2),y[0]==0}, y, {x, 0, 100}]
But i don't want to plot y[x] directly. I want to define a new function of y[x] and plot that function. So i tried this:
func1[x_] := (Evaluate[y[x]/.S])^-3;
Plot[func1[x], {x, 0, 100}]
But that doesn't work! I understand why this should be wrong but i don't know what's the correct way to do this.
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