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IMPORTANT what should be my first guess? need help ASAP !!! Rate Topic: -----

#1 Post icon  22 February 2012 - 08:38 PM Farzad Bashtani 


Lepton
Im planning to solve the following problem with trial and error in c++

Quote


find the minimum value of the following function .

Posted Image


"yi" and "xi" are the result of a complicated analysis on my lab data and I need to find a,b,c in a way that COST(a,b,c) function to be minimum.




after solving this equation by calculating the partial derivatives and force them to be equal to ZERO we obtain the attached equations for a b c.



Attached Image: a.JPG

Attached Image: b.JPG

Attached Image: c.JPG


as you can see we have to use the trial and error method to solve this problem for a b c

the problem is the first guess of a b c. based on the first guess the answer changes and usually goes to infinity !!!

Im asking you to help me to find the proper first guess.

Ive attached a set of sample xi yi data to the post too. Attached File  data_file.txt (301bytes)
Number of downloads: 11

just in case I attach the c++ class I have programmed to this post too. Attached File  PowerRegression.zip (1.45K)
Number of downloads: 9

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