Time display with a TMultigraph?

ROOT
1

Hi,

How can I use time display with a TMultigraph?

  1. ROOT ignores my timeoffset, for a TGraph I used to do gStyle->SetTimeOffset(timeoffset); but for TMultigraph it doesn’t work
  2. I want to enable a timedisplay on my x axis, but I get a segmentation violation when I try to. I found on google that I should use gPad->Update(); before using the function GetXaxis(), however this did not work. My temporary solution for this is to use Draw(), then access the axis and then Draw() again…

Thanks!

2

Here is an example which seems to work:

{
   TMultiGraph* mg = new TMultiGraph;
   TGraph* g = new TGraph;
   for (int i = 0; i < 100; i++) g->SetPoint(i, 1289420808+i, i+2);
   mg->Add(g, "P");
   mg->Draw("AP");
   mg->GetXaxis()->SetTimeDisplay(1);
   gPad->Modified();
   gPad->Update();
}
3

Thank you, it works now.

One more question, how do I know what the options mean in the Add function? They aren’t described in the manual.

4

they are the draw options of TGraph

5

Thanks =)