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Re: array addressing [message #2518 is a reply to message #2517]

Mon, 01 August 1994 14:06

thompson
Messages: 584
Registered: August 1991

Senior Member

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

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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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