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Special Nonlinear Fitting?


Hi,

I need to do a nonlinear fitting of data to a function, where I can't get
an explicit expression for the functions value.

Let me give you an example:

Assume I have the data point as pairs {x,y}

I want to "solve" the following relationship for the parameters a and b:

Y^2/X*f[Y^2/(X*a)]=b*given function of X.


with f[z]=z/Sqrt[1+z^2]...

Is there any procedure capable of this?

I must be able to enter an equation as the model, and state that "Y" is the
data value at each point.

Ideas, anybody?

Regards,

Erik

-- 
------------------------------------------------------------
Erik R. Lindahl                   f91el at efd.lth.se
Lund Institute of Technology, Lund, SWEDEN


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