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Addressing 3D arrays different from 2D arrays? [message #56583]

Tue, 06 November 2007 09:13

Jaron Kurk
Messages: 2
Registered: November 2007

Junior Member

Dear readers,

Apologies if this question has long been answered, but I could not
find anything on it.

Is there some fundamental difference in addressing 3D arrays and 2D
arrays? In IDL 6.3 (and GDL), the following code fills a 2D array with
a circle of 1's but a slice of a 3D array with a square of 1's, while
I would expect just the same area filled with 1's as for the 2D case.
Note that the use of reform() does not cause the difference, I have
checked that.

xidx=[5,4,5,6,3,4,5,6,7,4,5,6,5]
yidx=[3,4,4,4,5,5,5,5,5,6,6,6,7]
test2d = bytarr(10,10)
test3d = bytarr(10,10,10)
test2d[xidx,yidx] = 1
test3d[0,xidx,yidx] = 1
print,test2d,total(test2d)
print,reform(test3d[0,*,*]),total(test3d)

If anybody could enlighten me, I would appreciate it!

Jaron Kurk.

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[Message index]

		Addressing 3D arrays different from 2D arrays? By: Jaron Kurk on Tue, 06 November 2007 09:13
		Re: Addressing 3D arrays different from 2D arrays? By: Spon on Wed, 07 November 2007 05:09
		Re: Addressing 3D arrays different from 2D arrays? By: Foldy Lajos on Wed, 07 November 2007 05:01
		Re: Addressing 3D arrays different from 2D arrays? By: Spon on Wed, 07 November 2007 03:15
		Re: Addressing 3D arrays different from 2D arrays? By: Jaron Kurk on Wed, 07 November 2007 01:14
		Re: Addressing 3D arrays different from 2D arrays? By: Jean H. on Tue, 06 November 2007 09:34
		Re: Addressing 3D arrays different from 2D arrays? By: Spon on Tue, 06 November 2007 09:30
		Re: Addressing 3D arrays different from 2D arrays? By: Foldy Lajos on Tue, 06 November 2007 09:27

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