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

[Andreas Weber]

Am 24.02.19 um 12:42 schrieb insafba:
>   the data was firstly an x/y cartesian coordinates, which I transform to
> polar coordinates ( theta, radius). here is it in the file.
> moyen_cylindre.txt

okay, as I see theta goes from -pi/2 to pi/2. Do you only have a 
half-circle or there is a problem with your calculation form x/y to r/phi

radius jumps around +/-9, see the sign change which also indicates a 
problem. See plot (radius)

Try first to fix this.

Andy