Polar plots?

Colas · April 19, 2007, 2:26pm

Hi,
Does ROOT support 2D polar plots of histograms? I’m trying to draw contour lines on it, what I (think I) can’t achieve with the POL & SURF or LEGO options.
Any idea?

Cheers,
Colas

couet · April 19, 2007, 2:36pm

Use TGraphPolar. see:
root.cern.ch/root/html/TGraphPolar.html

Colas · April 19, 2007, 3:08pm

I may not have been clear, I’m trying to plot an histogram, not a graph.
In the picture attached, on the left is a 2D cartesian plot with 20 contours lines, and on the right side is a top view of a 3D plot with POL & CONT3 options.
I need to have a 2D polar plot with the contour lines. Is it feasible?

Thanks,
Colas

couet · April 19, 2007, 3:11pm

Ah ok. Use the SURF option (instead of SURF1) and you will get contour lines.

the POL option is valid only with LEGO and SURF. Not with CONT.