Re: polar coordinates from [-pi, pi] to [0, 2 pi]

[Andreas Weber]

H insafba,

You should learn how to describe problems accurately which is a crucial 
ability to do engeneering/scientific work.


Am 24.02.19 um 11:38 schrieb insafba:
> I have some data related to points of the perimeter of a circle (which is
> not perfect and have some deviations) that I collected from a 3D scan of a
> part.

"some data": x/y coordinates in a cartesian system? r(phi)? Equally 
spaced in time?

When I represent the data by polar commend, I have (as mentioned
> before) a circle. BUT, when I want to plot the deviation (the nominal radius
> - the actual data), I have a total mess representation as shown in the next
> figure
> <http://octave.1599824.n4.nabble.com/file/t373159/figure_with_mod.jpg>

Without showing the code which led to both plots it's very hard to guess 
what you are doing. One shows a polar plot, the other a cartesian plot

I can just guess that you are looking for something like "unwrap"

> I hope that all is clear.

No, it isn't

-- Andy