Fit Function again

Soeren Lange (soeren@pktw09.phy.tu-dresden.de)
Fri, 07 Mar 1997 16:38:25 +0100


> Soeren Lange wrote:
> >
> > how is it possible to fit with a user defined function?
> >

...

> > root [20] TF1 *f1 = new TF1("f1", "sin(x)", 0., 3.14);
> > root [21] graph->Fit("f1");
> > Illegal number of parameters = 0
> >

...

Rene Brun wrote:

> Look at the example:
> http://root.cern.ch/root/html/examples/multifit.C.html

I am sorry, but the example multifit.C is only using the predefined
fit function "gaus" which of course is working.
But how to fit with sin(x), cos(x), tan(x), ...?
Neither "sin(x)" nor "sin" nor "sinu" (like expo) is accepted.

Any help would be very much appreciated.

soeren