Hi,
In my mail, I clearly said "Using 3.05/07"
If you want this feature, upgrade your system to this version.
Rene Brun
On Thu, 7
Aug 2003, Dmitry A.
Shtol wrote:
> 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
> > >
> >
>
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