Hi Rooters, I solved the Problem myself... Was something stupid with the directories in the file... Greetings Frank On Wed, 24 Oct 2001, Frank Simon wrote: > Hi Rooters, > > I have a small macro that should read a histogram from file and draw > it in a canvas: > > > TH2F *hClusterRatio = > (TH2F*) f->Get("ClusterAmpRatioCoord_Smpl02;1"); > > hClusterRatio->Draw(); //Line 21 > > I get: > > Error: illegal pointer to class object hClusterRatio 0x0 141 > FILE:goldenrun.cc LINE:21 > > When I open the file, and call > ClusterAmpRatioCoord_Smpl02->Draw() > > I can display the histogram. However, I also want to make some > modifications, so I need the pointer. > > What could be the problem? > > I'm using SuSE Linux 7.4 and Root 3.02 precompiled. > > Thanks! > > Greetings > > Frank > >
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