Hi Phlip, You had several typing mistakes in your macro. Here is your macro modified to run. The main problem was that you forgot the p2->cd() before drawing the last frame. You also asked the question: "Why the interpreter can't warn over missing arguments?" In TPad::DrawFrame, the last argument is an optional argument. Rene Brun { gROOT -> Reset(); c1 = new TCanvas("c1","",200,10,700,500); p1 = new TPad("p1","p1",0.0,0.50,1,0.900000,46,3,1); p1->Draw(); p1->cd(); p1->SetGrid(); p1->DrawFrame (-0.59, -0.06498, 6.542, 0.714); const Int_t n0 = 6; Double_t x0[n0] = { 1.0,2.0,3.0,4.0,4.954,5.954 }; Double_t y0[n0] = { 0.2115,0.476,0.565,0.580,0.645,0.649 } ; TGraph *gr0 = new TGraph(n0,x0,y0); gr0->Draw("CP"); p1->Modified(); c1->Modified(); c1->cd(); TPad *p2 = new TPad("p2","p2",0.0,0.00,1,0.500000,46,3,1); p2->Draw(); p2->cd(); p2->DrawFrame (-0.5954, -0.0649, 6.5496, 0.71478); } On Wed, 14 Feb 2001, Phlip wrote: > Rooties: > > Here's the macro that crashes: > > { > gROOT -> Reset(); > c1 = new TCanvas("c1","",200,10,700,500); > p1 = new TPad("p1","p1",0.0,0.50,1,0.900000,46,3,1); > p1->Draw(); > p1->cd(); > p1->SetGrid(); > p1->DrawFrame (-0.59, -0.06498, 6.542, 0.714); > const Int_t n0 = 6; > Double_t x0[n0] = { 1.0,2.0,3.0,4.0,4.954,5.954 }, > y0[n0] = { 0.2115,0.476,0.565,0.580,0.645,0.649 } ; > gr0 = new TGraph(n0,x0,y0); > gr0->Draw("CP"); > p1->Modified(); > c1->Modified(); > c1->cd(); > TPad * p2 = new TPad("p2","p2",0.0,0.00,1,0.500000,46,3,1); > p2->Draw(); > p2->DrawFrame (-0.5954, -0.0649, 6.5496, 0.71478); > } > > > If I don't disable that last 'DrawFrame' call, it crashes like this: > > > ******************************************* > * * > * W E L C O M E to R O O T * > * * > * Version 2.25/03 14 September 2000 * > * * > * You are welcome to visit our Web site * > * http://root.cern.ch * > * * > ******************************************* > > CINT/ROOT C/C++ Interpreter version 5.14.50, Sep 2 2000 > Type ? for help. Commands must be C++ statements. > Enclose multiple statements between { }. > root [0] > Processing crasher.C... > > *** Break *** segmentation violation > Root > root [1] .q > > > Any clues? > > -- > Phlip phlip_cpp@my-deja.com > ============ http://c2.com/cgi/wiki?PhlIp ============ > -- Founding member of NuGWa - > Nudists for Global Warming -- >
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