Thank you for advice, but I have version 3.01/06, where this method
doesn't work.
This is a test:
//file MyF.C
float MyF(float x) {
return x*x;
}
root> .L MyF.C
root> h1->Draw("Eton","(Z1>0)*MyF(Eton)")
*ERROR 26 :
Unknown name : "MyF(Eton)"
(Int_t)(-1)
==============================================================
Dmitry A. Shtol (SND group)
Budker Institute of Nuclear Physics
On Wed, 6 Aug 2003, Rene Brun wrote:
> Hi
>
> Using 3.05/07, create a file w.C as below
>
> //file w.C
> double w(double z, double d, double sig) {
> double s2 = sqrt(2)*sig;
> return 0.5*(TMath::Erf((z+d)/s2-TMath::Erf((z-d)/s2));
> }
>
> then in ROOT, do
>
> root > .L w.C
> root > ntuple.Draw("el11","(z>0)*w(z1m,10,5)");
>
> Rene Brun
>
>
>
> On Wed, 6 Aug
> 2003, Dmitry A.
> Shtol wrote:
>
> > I asked this question some time before, but didn't get answer. I need
> > to use user defined function as a weight in TNtuple::Draw(). In PAW it
> > looks like that:
> >
> > app comis quit
> > real function w(z,d,sig)
> > real z,d,sig,s2
> > s2=sqrt(2.)*sig
> > w=0.5*(erf((z+d)/s2)-erf((z-d)/s2))
> > end
> > quit
> >
> > *************
> >
> > nt/pro [id] [idn] el11 [cond]*w(z1m,10.,5.)
> >
> > Where el11 and z1m are elements of ntuple.
> > What is the simplest way to do it in ROOT?
> >
> > ==============================================================
> > Dmitry A. Shtol (SND group)
> > Budker Institute of Nuclear Physics
> >
>
This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:14 MET