Hi, I have this 3 column data file data_test.txt (274 Bytes) . I have plotted it using the following. TH3F *h3 = new TH3F("h3","3D",500,100,1000,500,500,1000,100,500,1000); for (unsigned i = 0; i < n; ++i) { in >> x >> y >> z; if (!in.good()) break; h3->Fill(x,y,z); } h3->Draw("cont4"…

or just: h3->Draw(“ISO”); See the link I sent you.

And if I want to get a parametric equation out of it, then is there any option?

That’s not Drawing . May be have a look at 3D histogram fitting.

h3->Draw(“ISO”); is creating something like this...not a colored surface.!

Yes, it is mono color. See the Help. Try GLISO (with SetCanvasPreferGL before. See Help) Also see if one of the examples here https://root.cern/doc/master/group__tutorial__gl.html matches what you are looking for.

I have tried with GLISO also, but, didn’t work.

It might be there too less points to draw a surface through them using the available floating options. May be try to do a 3D fit.

Yeah, may be because of less data points… But, how to do a 3D fit and get an equation back?

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Plot with extrapolation and interpolation

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couet November 13, 2019, 8:03am 13

How to fit TH3 histogram ROOT

Hi, I need to fit 3D histogram with 3D function, but I can’t find any fit method in the description of the TH3 Class. Could you please provide me with any useful documentation.

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