TGraph myGraph(10); for(int i=0; i<10; i++){ myGraph.SetPoint(i, i*i, 2*i); //Set 10 points on graph } Double_t xVal = myGraph.GetX(5); //Get x-value of the point at index 5
TGraph *myGraph = new TGraph(); myGraph->ReadFile("data.txt"); Double_t xVal = myGraph->GetX(10); //Get x-value of the point at index 10In this example, we create a TGraph pointer and read data from a text file using the ReadFile method. Then we call the GetX method with an index of 10 to retrieve the x-value of the point at that index. Overall, the TGraph GetX method is used in combination with other TGraph member functions to retrieve and manipulate data points in a graph.