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Re: Addressing 3D arrays different from 2D arrays? [message #56678 is a reply to message #56583]

Wed, 07 November 2007 03:15

Spon
Messages: 178
Registered: September 2007

Senior Member

Spon wrote:
> I can get rid of it, but I'm not sure why you're getting a square (as
> opposed to just junk):
>
Ok, now *I'm* confused:

*** Code

pro threedtest
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]

print, 'Fixed version.'
zidx = REPLICATE (0, N_ELEMENTS (xidx))
test2d = bytarr(10,10)
test3d = bytarr(10,10,10)
test2d[xidx,yidx] = 1
test3d[zidx,xidx,yidx] = 1
print,test2d,total(test2d)
print,reform(test3d[0,*,*]),total(test3d)
print, ''
print, 'Original version.'
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)
print, ''
print, 'Concatenated version.'
subscripts = [0, xidx, yidx]
test2d = bytarr(10,10)
test3d = bytarr(10,10,10)
test2d[xidx,yidx] = 1
test3d[subscripts] = 1
print,test2d,total(test2d)
print,reform(test3d[0,*,*]),total(test3d)

return
end

*** End of Code

...
IDL> Concatenated version.
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 1 0 0 0 0
0 0 0 0 1 1 1 0 0 0
0 0 0 1 1 1 1 1 0 0
0 0 0 0 1 1 1 0 0 0
0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
13.0000
1 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
6.00000

***End of Output

Why does OP get a nice square whereas I just get a solitary 1 in the
corner? :-(
What is concatenating before defining the subscripting causing IDL to
do differently?

Just curious,
Chris

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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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