| Plotting a 3D Array In IDL [message #25778] |
Tue, 17 July 2001 16:56  |
K. Banerjee
Messages: 4
Registered: July 2001
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Junior Member |
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Say I have a 3D array whose elements are only 1 or 0. I'd like to plot
this array, say a white dot for the 1's and a red dot for the 0's. Is there
a way I can do this in IDL?
(I'm fairly new to IDL and thre's probably a straight forward
way to do this!)
Thanks.
K. Banerjee
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| Re: Plotting a 3D Array In IDL [message #25849 is a reply to message #25778] |
Thu, 19 July 2001 07:16  |
Paul van Delst
Messages: 364
Registered: March 1997
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Senior Member |
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eddie haskell wrote:
>
>> Say I have a 3D array whose elements are only 1 or 0. I'd like to plot
>> this array, say a white dot for the 1's and a red dot for the 0's. Is there
>> a way I can do this in IDL?
>
> Below is a program fragment that does what I think you want done. There might
> be a slick one line way of doing it or maybe something visually stunning using
> object graphics but nothing currently leaps to mind.
>
> Cheers,
> eddie
>
> ;--------------------------
> n = 4
> a = randomu(seed,n,n,n) gt 0.5
> surface, dist(n), /nodata, zr=[0,n-1], /save
> tvlct,[0,255],[255,0],[0,0],1
>
> for j = 0,1 do begin
> wh = where(a eq j)
> x = wh mod n
> y = wh / n mod n
> z = wh / n^2
> for i = 0, n_elements(wh)-1 do $
> plots,x[i],y[i],z[i],/t3d,psym=2,color=j+1
> endfor
> ;-----------------------
Cool - I couldn't figure out how to do it. I modified the above a little to use plot3d
n = 4
a = randomu(seed,n,n,n) gt 0.5
tvlct,[0,255],[255,0],[0,0],1
for j = 0,1 do begin
wh = where(a eq j)
x = wh mod n
y = wh / n mod n
z = wh / n^2
plot3d, x,y,z,psym=2,color=j+1,oplot=j
endfor
but I find the resultant plot hard to interpret. I think this is a case where object
graphics is required to give some depth to the plot by varying the size of the plotting
symbols with perceived depth... or something like that.
paulv
--
Paul van Delst A little learning is a dangerous thing;
CIMSS @ NOAA/NCEP Drink deep, or taste not the Pierian spring;
Ph: (301)763-8000 x7274 There shallow draughts intoxicate the brain,
Fax:(301)763-8545 And drinking largely sobers us again.
Alexander Pope.
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| Re: Plotting a 3D Array In IDL [message #25863 is a reply to message #25778] |
Wed, 18 July 2001 09:20 |
eddie haskell
Messages: 29
Registered: September 1998
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Junior Member |
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> Say I have a 3D array whose elements are only 1 or 0. I'd like to plot
> this array, say a white dot for the 1's and a red dot for the 0's. Is there
> a way I can do this in IDL?
Below is a program fragment that does what I think you want done. There might
be a slick one line way of doing it or maybe something visually stunning using
object graphics but nothing currently leaps to mind.
Cheers,
eddie
;--------------------------
n = 4
a = randomu(seed,n,n,n) gt 0.5
surface, dist(n), /nodata, zr=[0,n-1], /save
tvlct,[0,255],[255,0],[0,0],1
for j = 0,1 do begin
wh = where(a eq j)
x = wh mod n
y = wh / n mod n
z = wh / n^2
for i = 0, n_elements(wh)-1 do $
plots,x[i],y[i],z[i],/t3d,psym=2,color=j+1
endfor
;-----------------------
------------------------------------------
A G Edward Haskell
Center for Coastal Physical Oceanography
Old Dominion University, Norfolk VA 23529
e-mail haskell*ccpo.odu.edu
------------------------------------------
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| Re: Plotting a 3D Array In IDL [message #25864 is a reply to message #25778] |
Wed, 18 July 2001 09:07 |
Pavel A. Romashkin
Messages: 531
Registered: November 2000
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Senior Member |
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Could you give an idea what kind of a plot you want to make?
Do you mean 3D to be Array[10,10,10] or is it an XYZ-type data set - Array[10,10]?
Cheers,
Pavel
"K. Banerjee" wrote:
>
> Say I have a 3D array whose elements are only 1 or 0. I'd like to plot
> this array, say a white dot for the 1's and a red dot for the 0's. Is there
> a way I can do this in IDL?
>
> (I'm fairly new to IDL and thre's probably a straight forward
> way to do this!)
>
> Thanks.
>
> K. Banerjee
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