Dear Rooters, I'm trying to plot a set of data to which new points are continuously being added. To test this out, I wrote the following macro, which calculates the difference between two values and then plots the difference. I included a loop that increases the number of points to graph with each iteration, and redraw the graph with every iteration. The graph works as I had hoped, clearing the active pad and redrawing the graph each time a new data point is added. However, I can't seem to get the axes to redraw, and this results in a bunch of different overlapping scales on both the x- and y-axis. Any suggestions? Thanks, Jason void Dynamic() { Int_t i; const Int_t N = 32; Double_t x[N+1] = { 293., 291., 288., 286., 280., 270., 260., 250., 240., 230., 220., 210., 200., 190., 180., 170., 160., 150., 140., 130., 120., 110., 100., 90., 80., 70., 60., 50., 40., 30., 20., 10., 0. }; Double_t y[N+1] = { 52.1705, 81.5672, 0.0, 37.2873, 118.617, 203.3, 270.579, 349.675, 430.074, 511.98, 593.394, 667.308, 753.741, 828.314, 906.517, 984.533, 1065.13, 1144.57, 1221.71, 1300.72, 1385.65, 1467.83, 1552.11, 1633.02, 1711.6, 1796.59, 1881.22, 1967.85, 2051.02, 2135.62, 2221.47, 2311.31, 2400.0 }; Double_t dy[N] = {0.}; for (i=N-1; i>0; i--) dy[i] = y[i+1] - y[i]; TCanvas *c1 = new TCanvas("c1","Voltage Differences",1); for (i = 1; (i < N); i++) { TGraph *gr1 = new TGraph(i); gr1->SetMarkerStyle(7); gr1->SetMarkerColor(4); gr1->SetMarkerSize(2); gr1->SetLineColor(4); gr1->DrawGraph(i, x, dy, "ALP"); gPad->Update(); delete gr1; } } p.s, I'm using version 3.05/05. _________________________________________________________________ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus
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