| Author |
Comment/Response |
Nasser M. Abbasi
|
 11/24/12 00:50am
f1[x_] := Sin[2*Pi*x/10] + I*Cos[2*Pi*x/20]
f2[x_] := Abs[f1[x]]
f3[x_] := f2'[x]
f3[1]
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Assuming the above is _supposed_ to work. Then the question is how can you be asking Mathematica to take derivative of a function with respect to a number?
But to solve this, change f2'[x] to D[f2[x],x]
And now you'll get the expected result that you can't do what you are trying to do:
----------------------
In[8]:= f3[1]
During evaluation of In[8]:= General::ivar:1 is not a valid variable. >>
Out[8]= D[Sqrt[5]/2, 1]
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--Nasser
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