Hi Hermine,
I have no problems in doing:
root > .L tryFit.C
root > TF1 *fFit = new TF1("fFit", fFitLandGaus, 0, 20,4);
I can call your InitFunctions without problems. However, I cannot
execute FitLandGaus because you forgot to send the LGconvl function
and the Gaus function.
For an example of fitting with multiple functions, see
$ROOTSYS/tutorials/FittingDemo.C
Rene Brun
On Mon, 17 Jun 2002, Hermine Woehri wrote:
> Hello,
>
> I want to use a function from a user defined library, which I load
> whenever I start a root session (this function is a convolution of a
> Landau with a Gauss).
>
> When I draw this function or add a print-out statement if this function is
> known, there is no problem: I indeed see the function drawn on a canvas.
> However, when I try to define a new function
> using this predefined function,
> TF1 *fFit = new TF1("fFit", "fFitLandGaus", 0, 20,4);
> or
> TF1 *fFit = new TF1("fFit", fFitLandGaus, 0, 20,4);
>
> I get the following error message:
>
> Function:fFit cannot be compiled
>
> I have attached a few lines of code, where you can follow up the steps,
> that I want to do.
>
> The final command that I want to use is:
>
> TF1 *fFit = new TF1("fFit", "fFit+f1", 0, 20,7);
>
> I saw that it is possible to "add" two predefined function on the webpage
> for the TF1 - class (http://root.cern.ch/root/html302/TF1.html)
>
>
> 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");
> }
>
>
> I hope it is a trivial problem to solve,
>
> Thank you,
>
> Hermine Woehri
>
>
>
> +------------------------------------------------------+
> |Hermine Katharina Woehri hermine.woehri@cern.ch |
> +------------------------------------------------------|
> |EP Division office: +41 22 767 9408|
> |CERN mobile: +41 79 201 0715|
> |CH-1211 Geneve 23 fax: +41 22 767 9780|
> |Switzerland private: +33 450 42 4415|
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