1D Polar Plots

moritz · October 30, 2005, 11:29pm

Dear ROOTers,

how can I draw a TH1D with 1D polar coordinates like in the image attached?

histo->Draw("POL");

just gives me an empty(!) cartesian coordinate system.

Thanks

Moritz

couet · October 31, 2005, 8:50am

Polar plots are now implemented only for lego and surfaces. It is in our plans to implement them for 1d histograms too. Which package produced the plot you sent ? have you some more examples ?

moritz · October 31, 2005, 6:45pm

Hi,

well, this feature is important for me. I will have to generate many of those plots from a ROOT-based analysis.
The example I sent was made with Origin (the ugly manual export / import way). There is a free rewrite for Linux called SciGraphica (http://scigraphica.sourceforge.net). They show a very fancy example under http://scigraphica.sourceforge.net/images/polar.jpg. And I found a whole bunch of examples created with gnuplot (http://gnuplot.sourceforge.net/demo/poldat.html; http://gnuplot.sourceforge.net/demo/polar.html).

Thanks,

Moritz

couet · November 1, 2005, 2:15pm

I did an example producing some simple polar graph. See:
couet.home.cern.ch/couet/root/ht17.html

moritz · November 8, 2005, 2:53pm

Thank you very much!
I built a little class around your code sample.
TPolarGraph.C (3.52 KB)