Modifying Radius Labels in Polar Plot

[gciriani]

I've read many posts about modifying the value of Polar labels, and it seems
that it is not possible. However, as I was checking the properties of the
plot, I found a description for xticklabel that seems to correspond with the
values displayed in my polar radius. My radius displays values calculated in
radians from 0 to 3. The get(gca) shows 

Since I would like to label the radius with 180 instead of 3.14 I was
wondering if a command that resembles the following would do the trick.

I tried a couple of variations but there is no apparent change. Obviously I
will have to make other adjustments, but this would be a start.



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Giovanni Ciriani - Windows 10, Octave 4.2.1, configured for x86_64-w64-mingw32
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