GetPoint() in TGraphErrors

From: Pascal Perrodo (perrodo@lapp.in2p3.fr)
Date: Sun Jan 18 1998 - 17:11:09 MET 

Hi,

I use the ROOT version 1.03/08  24 November 1997.

I call the function

GetPoint() for a TGraphErrors using the example code :

Float_t xi,yi;
graph_emiss_a_vda_fine0->GetPoint(1,&xi,&yi);
printf("xi,yi = %f %f \n",xi,yi);

and I get the following message :

Error: Can't call TGraphErrors::GetPoint() in current scope
FILE:/users/atlas/perrodo/perso/aleph/btau/analysis/root/./study_histos.C
LINE:87
*** Interpreter error recovered ***

How is it possible to make this function work ?

Thanks in advance.
Cheers.
                             Pascal

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