How to get point values from TMultiGraph?

[Vladislav]

Hello!

I want to get point values from TMultiGraph.
If I have TGraph object I can write this code:

const int N_points = graph->GetN();
double x, y;
for(int i=0; i < N_points; i++)
{
	graph->GetPoint(i, x, y); 
	cout << "f(" << x << ") =" << y <<endl;
}

But how to do this in case of TMultiGraph object, if I have several graphs in it?
I don’t see sothing like GetPoint().
Could you help me?

Thank you in advance.
Best regards, Vladislav.

[Vladislav]

I found this talk:

Get tgraph from tmulltigraph

Hello everyone, I would appreciate a feedback on the following problem I have a canvas c_FAD, which has a tmultigraph mg_FAD. Only one tgraph is added to this tmultigraph, with name gr_FAD. I can extract the canvas from the root file as TCanvas cfr = (TCanvas)fr.Get(“c_FAD”); now how shall I proceed to extract the tgraph gr_FAD ? thanks

TMultiGraph::GetListOfGraphs returns a list of TGraphs, you can iterate over this list.

But how to iterate?
Could you give simple working example?

[couet]

This one gives an example:

Fit a TMultiGraph by loading a .root file into a script

To get the individuals graphs from a TMultiGraph you should do a loop similar to: TList* grlist; grlist = mg->GetListOfGraphs(); printf("This multi-graph contains %d graphs\n",grlist->GetSize()); TIter next(grlist); TObject *obj; TGraph *gr; while ((obj = next())) { gr=(TGraph*)obj; ... }