Does anyone know how to extract data from a surface plot? i.e.
using the command
TGraph2D *g = new TGraph2D(file.dat);
gives a surface fit to points in file.dat. Is it possible to extract the extrapolated data in-bewteen points?
The surface in TGraph2D is drawn after creating a 2D histogram with TGraphDelaunay.
You can either get the default histogram with TGraph2D::GetHistogram(), or create your own TGraphDelaunay object using the TGraphDelaunay(TGraph2D *) constructor and then call TGraphDelaunay::Interpolate(x,y) for all the points that you need.
righto! I’ll give it a try.
thanks a lot.