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Topic: I need help - derivative
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Maciej

Posts: 8
Registered: 11/5/07
I need help - derivative
Posted: Nov 5, 2007 5:25 AM
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Hi

I need to count derivative (with respect for a, then with respect for b) and find value of parameters (a and b) of that function

dy/da= [b*(a^-b)*(x1^b-1)*[e^(-(x1/a)^b)]] *
* [b*(a^-b)*(x2^b-1)*[e^(-(x2/a)^b)]] *
* ... *
* [b*(a^-b)*(xn^b-1)*[e^(-(xn/a)^b)]]

dy/da=0

a=?

dy/db= [b*(a^-b)*(x1^b-1)*[e^(-(x1/a)^b)]] *
* [b*(a^-b)*(x2^b-1)*[e^(-(x2/a)^b)]] *
* ... *
* [b*(a^-b)*(xn^b-1)*[e^(-(xn/a)^b)]]


dy/db=0

b=?



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