See the following in the TF1 documentation
...
Fernanda Gallinucci Garcia wrote:
>
> Hi,
>
> I fitted two 8th degree polinomial to my data. Now,
> I would like to compare these 2 curves. I created another function
> that is the combo of the first two. Root crashes.
> Why can't a TF1 object reference to other TF1 if is a polN?
>
> Is there a way to make this comparison? What should I do?
> Thanks
//
// TF1 objects can reference other TF1 objects (thanks John Odonnell)
// of type A or B defined above.This excludes CINT interpreted functions
// and compiled functions.
// However, there is a restriction. A function cannot reference a basic
// function if the basic function is a polynomial polN.
// Example:
//{
// TF1 *fcos = new TF1 ("fcos", "[0]*cos(x)", 0., 10.);
// fcos->SetParNames( "cos");
// fcos->SetParameter( 0, 1.1);
//
// TF1 *fsin = new TF1 ("fsin", "[0]*sin(x)", 0., 10.);
// fsin->SetParNames( "sin");
// fsin->SetParameter( 0, 2.1);
//
// TF1 *fsincos = new TF1 ("fsc", "fcos+fsin");
//
// TF1 *fs2 = new TF1 ("fs2", "fsc+fsc");
//}
//
Rene Brun
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