Hi Rooters,
I want to plot a data file which has 999999 lines, I used TGraph class in ROOT but I can't get a figure but just a canvas with axis instead.
My code is listed below and according to ROOT Guide, Int_t is 4 Bytes, ranges from -2^{31} to 2^{31}-1 and 999999 is actually in this range. And I also tried "Long64_t", by which I still can't get the figure I wanted. I don't know what's wrong.
{
gROOT->Reset();
TCanvas *c1 = new TCanvas("c1"," ",200,10,700,500);
TH1F *hr = c1->DrawFrame(0.0001,0.00001,1,100);
c1->SetLogx(); c1->SetLogy(); ifstream my("test.dat");
gr->SetLineWidth(2); gr->GetXaxis()->SetTitle("x"); gr->GetYaxis()->SetTitle("f(x)"); gr->Draw("CP");
Thanks for any help.
Regards,
Hengtong
-- ************************************************Received on Wed Apr 19 2006 - 04:00:43 MEST
* Hengtong Ding *
* *
* Address: Institute of Particle Physics, *
* Central China Normal University *
* Wuhan, 430079, P. R. China *
* Tel: 0086 27 6786 7946 (lab) *
* 0086 27 8715 0351 (dormitory) *
* Fax: 0086 27 6786 3213 *
* Email: dinght_at_iopp.ccnu.edu.cn *
* dinghengtong_at_hotmail.com * ************************************************
This archive was generated by hypermail 2.2.0 : Mon Jan 01 2007 - 16:31:58 MET