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Re: array addressing [message #2517 is a reply to message #2516]

Mon, 01 August 1994 15:04

peter
Messages: 80
Registered: February 1994

Member

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...

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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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