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Re: 3D Scatter Plot [message #89370 is a reply to message #89369]

Thu, 28 August 2014 20:39

Jim Pendleton
Messages: 165
Registered: November 2011

Senior Member

On Thursday, August 28, 2014 3:38:34 PM UTC-6, Paul van Delst wrote:
> On 08/28/14 17:29, Paul van Delst wrote:
>
>> On 08/27/14 18:40, sjone7 wrote:
>
>>> How might one add error bars to a 3d scatter plot?
>
>>
>
>> How about plotting the data as semi-transparent orbs where the
>
>> dimensions of the orbs represent the error bar extents?
>
>>
>
>> See David Fanning's example code at:
>
>> http://www.idlcoyote.com/tip_examples/scatter_surface.pro
>
>> The original article is at:
>
>> http://www.idlcoyote.com/tips/scatter3d.html
>
>
>
> I forgot to mention that you will have to define your own non-spherical
>
> orb object (the one that comes with the IDL example code is spherical).
>
>
>
> I guess it would be an "ellipsoid" object. Modifying the orb object
>
> shouldn't be too hard (he says!) since it's the degenerate case where
>
> the principal axes are all the same.
>
>
>
> It will be a interesting programming exercise.
>
>
>
> I wonder how fast it would render for, say, 10000 points?
>
>
>
> cheers,
>
>
>
> paulv

The orb object can be scaled anisotropically to turn it into an ellipsoid, without modifying the orb class itself.

IDL> o = orb()
IDL> o.scale, 1., 1.5, 1.
IDL> xobjview, o

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[Message index]

		3D Scatter Plot By: aecorner on Thu, 06 April 2006 06:55
		Re: 3D Scatter Plot By: sjone7 on Wed, 27 August 2014 15:40
		Re: 3D Scatter Plot By: Paul Van Delst[1] on Thu, 28 August 2014 14:29
		Re: 3D Scatter Plot By: Paul Van Delst[1] on Thu, 28 August 2014 14:38
		Re: 3D Scatter Plot By: Jim Pendleton on Thu, 28 August 2014 20:39

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