Polar graph 2d

Hello

Im interested in drawing a 2d polar graph.I looked up the Root class index but couldnt find any appropriate link.

What basically is required is always:
I have dat file with three columns : parameter 1 , parameter2 ( angle) , Final value

Instead of plotting a contour plot , i want to plot a polar plot and see the variation.
KIndly Help…

This is not implemented.
Sorry