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Re: array addressing [message #2516 is a reply to message #2514]

Mon, 01 August 1994 16:49

kucera
Messages: 7
Registered: June 1994

Junior Member

In article <CtvMnL.MAD@hpl.hp.com>, peter@hpl.hp.com (Peter Webb) writes...
> William Thompson (thompson@orpheus.gsfc.nasa.gov) wrote:
> : kump@morph.ebme.cwru.edu (Kenneth S. Kump) writes:
>
> : >Just a quick question:
>
> : >A=indarr(10,5)
> : >B=[0,0,1,0,1]
>
>
> : >I would like array C to consist of only A(*,2) and A(*,4).
> : >I understand why C=A(*,B) doesn't work, but what is the
> : >correct way?
>
> : Just thinking off the top of my head, one could do something like the
> : following:
>
> : IDL> SZ = SIZE(A) ;Get dimensions of A
> : IDL> BB = REPLICATE(1,SZ(1)) # B ;Match dims. of B to A
> : IDL> C = A(WHERE(BB EQ 1)) ;Extract requested data
> : IDL> C = REFORM(C,SZ(1),TOTAL(B)) ;Rectify dimensions
>
> : I haven't actually tried this to confirm that it works, but I think it will.
> : :^)
>
> : Bill Thompson
>
> Or, c=a(*,[2,4]) might be a bit easier...

Or, c=a(*,where(b)) if you don't know b ahead of time.
Terry Kucera

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[Message index]

		Re: array addressing By: sjt on Tue, 02 August 1994 02:44
		Re: array addressing By: kucera on Mon, 01 August 1994 16:49
		Re: array addressing By: peter on Mon, 01 August 1994 15:04
		Re: array addressing By: thompson on Mon, 01 August 1994 14:06

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