TGraphErrors X axis range

ROOT
1

I want to plot multiple data sets into a TGraphErrors with a fixed x axis range of [0, 360]

    TCanvas canvas;
    vector<TGraphErrors*> graphs;

    for (int i=0; i<inputRunNumbers.size(); i++) {
        stringstream filenameIntegrityData;
        filenameIntegrityData << inputRunNumbers.at(i) << "/TimeOfFlightScanData.dat";
        matrix_double inputIntegrityData;
        vector<double> inputSubRunNumbers, inputAzimuthalAngles, inputFlightTimes, inputFlightTimesErr;
        read_ascii_file(filenameIntegrityData, inputIntegrityData);
        inputSubRunNumbers = inputIntegrityData.at(0);
        inputAzimuthalAngles = inputIntegrityData.at(1);
        inputFlightTimes = inputIntegrityData.at(2);
        inputFlightTimesErr = inputIntegrityData.at(3);
        graphs.push_back(new TGraphErrors());

        for (int j=0; j<inputSubRunNumbers.size(); j++) {
            double tof = fmod(inputFlightTimes[j], repetitionTime);
            if (tof < 0) tof += repetitionTime;
            graphs.back()->SetPoint(inputSubRunNumbers[j], inputAzimuthalAngles[j], tof);
            graphs.back()->SetPointError(inputSubRunNumbers[j], .0, inputFlightTimesErr[j]);
        }

        graphs.back()->SetMarkerStyle(7);
        graphs.back()->SetMarkerColor(2+i);

        if(i==0) {
            graphs.back()->Draw("AP");
            graphs.back()->GetXaxis()->SetRangeUser(0, 360.0);
            graphs.back()->GetYaxis()->SetRangeUser(0, repetitionTime);
            graphs.back()->Draw("AP");
            canvas.Update();
        }
        else {
            graphs.back()->Draw("P");
            canvas.Update();
        }
    }

(inside a for-loop)

However, since the first data set goes only from 0 to ~120, the line

graphs.back()->GetXaxis()->SetRangeUser(0, 360.0);

is ignored. Could someone give me a hint? Why the heck is it not possible in ROOT to force an x axis range wider than the data?

Best thanks, Nicholas

2

see: