| Re: cylindrical mapping [message #17551] |
Fri, 29 October 1999 00:00 |
Mirko Vukovic
Messages: 124
Registered: January 1996
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Senior Member |
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In article <38192F61.44A514D2@physics.usyd.edu.au>,
Chris Rennie <rennie@physics.usyd.edu.au> wrote:
> Sure.
> I have a phase angle (-Pi .. +Pi) as a function of time.
> A flat 2D plot is somewhat unsatisfactory if the data
> frequently 'wraps around' from -Pi and +Pi, and so I
> was curious to see the data mapped onto a cylinder.
>
> I can create a 3D version of the time series from Times[]
> and Phase[] by:
> Phase3d[0,*]=Times
> Phase3d[1,*]=sin(Phase)
> Phase3d[2,*]=cos(Phase)
>
> and view the result from various angles. But I am hoping
> that someone out there has done the harder work of supplying
> axes, hidden line removal, or imaginative shading etc. Such
> plots are hard to visualize without additional depth cues.
> If you have any ideas, please let me know...
> Chris
>
I don't have much experience in 3d plotting, and the little I had
did not provide easy to understand plots. How about
unwrapping the phase so it goes form 0 to n*2pi and plotting
in 2D. Does that
make any sense? What is changing from one 2pi interval to the next?
Mirko
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| Re: cylindrical mapping [message #17557 is a reply to message #17551] |
Fri, 29 October 1999 00:00  |
Chris Rennie
Messages: 6
Registered: October 1999
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Junior Member |
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> Chris Rennie <rennie@physics.usyd.edu.au> wrote:
>> Can anyone suggest a shortcut for plotting a timeseries in
>> cylindrical coordinates? I would like to plot a phase angle
>> as a function of time (which is to be the axial coordinate),
>> and would like to try this representation.
>
> I did not quite understand what is plotted vs. what and
> in what coordinate system. Can you elaborate?
>
> Mirko
Sure.
I have a phase angle (-Pi .. +Pi) as a function of time.
A flat 2D plot is somewhat unsatisfactory if the data
frequently 'wraps around' from -Pi and +Pi, and so I
was curious to see the data mapped onto a cylinder.
I can create a 3D version of the time series from Times[]
and Phase[] by:
Phase3d[0,*]=Times
Phase3d[1,*]=sin(Phase)
Phase3d[2,*]=cos(Phase)
and view the result from various angles. But I am hoping
that someone out there has done the harder work of supplying
axes, hidden line removal, or imaginative shading etc. Such
plots are hard to visualize without additional depth cues.
If you have any ideas, please let me know...
Chris
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