To add to Rene's answer, if your application should always be in batch mode (without you having to specify -b) do: int main(int argc, char **argv) { gROOT->SetBatch(); // must be set before TApplication is created TApplication theApp("App", &argc, argv); Cheers, Fons. ----- Forwarded message from Rene Brun <Rene.Brun@cern.ch> ----- Date: Mon, 25 Sep 2000 08:03:52 +0200 (METDST) From: Rene Brun <Rene.Brun@cern.ch> To: Kevin Reil <reil@physics.utah.edu> cc: roottalk@pcroot.cern.ch Subject: Re: [ROOT] No Xwindows Hi Kevin, Use the option "-b" when you invoke your application. Assuming that your executable is called myprog, do myprog -b In order to read the parameter given to the application, you should modify your code as indicated in your below: #include ... #include "TROOT.h" TROOT simple("simple","Extract Flashers"); int is_laser3(...); int main(int argc, char **argv) { TApplication theApp("App", &argc, argv); Rene Brun On Fri, 22 Sep 2000, Kevin Reil wrote: > Hi, > > I have a program which consists of a main procedure in one file and a > library routine compiled in another. > > I wish to only fill histograms, fit and take the fit parameters, never > to display anything. I do this successfully, however, when I run > remotely I get cannot open DISPLAY errors (or with DISPLAY exported) I > get alot of network activity (I assume X packets) before the program > starts running. No windows pop up as I have been careful not to request > any. Here is the sketch. > QUESTION: how do I tell it to use NO xwindows? > At work it's not noticeable, but through ssh tunnel behind firewall and > over cable to my house is a little slow and annoying (and pointless). > > I thought perhaps removing the TROOT or TApplication lines, but I want > to be able to turn on display of the hists with a command line > parameter. > > extract_laser2.cpp (main) > > #include ... > #include "TROOT.h" > TROOT simple("simple","Extract Flashers"); > TApplication theApp("App", 0, NULL); > int is_laser3(...); > > int main(int argc, char *argv[]) > { > no root calls... > check1=is_laser3(); > } > > is_laser3.cpp (library) > > #include "TROOT.h" > #include "TH1.h" > #include "TCanvas.h" > #include "TF1.h" > > int is_laser3(...) > { > ... fillsome numbers for hist... > > TH1F *t1 = new TH1F("t1","Hist of deviation",200,-90,90); > for (int j=0; j<ntubes; ++j) > { > t1->Fill(acos(tubehits[j].dev)*r2d-90); > } > TF1 *f1 = new TF1("f1","gaus",1,3); > t1->Fit("f1","NQ"); > Double_t chi2 = f1->GetChisquare(); > Double_t amp = f1->GetParameter(0); > Double_t x0 = f1->GetParameter(1); > Double_t sig = f1->GetParameter(2); > t1->Delete(); > > } > ----- End forwarded message ----- -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7677910
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