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Fitting an implicit function with IDL [message #71315]

Tue, 08 June 2010 03:54

Gianluca Li Causi
Messages: 21
Registered: August 2005

Junior Member

Hi all,
I have to find the A, B and C parameters which best satisfy (in the
chi-square sense) the following equation:

A * g(x) + (W(x) + B) / (X(x) + C) = 0

where g(x) is a known function of x and (W +/- sigmaW) and (Z +/-
sigmaZ) are two sets of measured data together with their measurement
errors.

This is different from the usual form F(x, A,B,C) = Y where a function
of x and parameters is to be fitted to a dataset (Y +/- sigma_Y).
So, how to use the various IDL fitting routines to solve this
problem??

Thanks a lot to anybody who can help!
Cheers
Gianluca

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