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

**From**: |
Andreas Weber |

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

**Date**: |
Sun, 24 Feb 2019 12:02:16 +0100 |

**User-agent**: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 |

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

**polar coordinates from [-pi, pi] to [0, 2 pi]**, *insafba*, `2019/02/23`
**Re: [BEWARE-SUSPECTED SPAM]polar coordinates from [-pi, pi] to [0, 2 pi]**, *Montgomery-Smith, Stephen*, `2019/02/23`
**Re: [BEWARE-SUSPECTED SPAM]polar coordinates from [-pi, pi] to [0, 2 pi]**, *Montgomery-Smith, Stephen*, `2019/02/23`
**Re: [BEWARE-SUSPECTED SPAM]polar coordinates from [-pi, pi] to [0, 2 pi]**, *insafba*, `2019/02/23`
**Re: polar coordinates from [-pi, pi] to [0, 2 pi]**, *Montgomery-Smith, Stephen*, `2019/02/23`
**Re: polar coordinates from [-pi, pi] to [0, 2 pi]**, *insafba*, `2019/02/23`
**Re: polar coordinates from [-pi, pi] to [0, 2 pi]**, *Andreas Weber*, `2019/02/24`
**Re: polar coordinates from [-pi, pi] to [0, 2 pi]**, *insafba*, `2019/02/24`
**Re: polar coordinates from [-pi, pi] to [0, 2 pi]**,
*Andreas Weber* **<=**
**Re: polar coordinates from [-pi, pi] to [0, 2 pi]**, *insafba*, `2019/02/24`
**Re: polar coordinates from [-pi, pi] to [0, 2 pi]**, *Andreas Weber*, `2019/02/24`
**Re: polar coordinates from [-pi, pi] to [0, 2 pi]**, *Uwe Damm*, `2019/02/25`