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Re: REPLICATE with arrays [message #18897 is a reply to message #18884]

Fri, 11 February 2000 00:00

Liam E. Gumley
Messages: 378
Registered: January 2000

Senior Member

Vince Hradil <hradilv@yahoo.com> wrote in message
news:38A43130.D0ACB994@yahoo.com...
> I often have the need to replicate an array, but IDL's replicate only
> works with scalars. Does anyone have any tips on the most efficient,
> simplest, clearest (you choose) way to do this?
>
> e.g.
>
> I have:
> help, x
> INT = Array[3, 3]
> print, x
> 2 4 10
> 3 7 5
> 3 9 2
>
> and would like to do:
> x2 = replicate(x,2)
> help, x2
> INT = Array[3, 3, 2]
> print, x2
> 2 4 10
> 3 7 5
> 3 9 2
>
> 2 4 10
> 3 7 5
> 3 9 2
>
> I've figured out some trick for 1 and 2 dimensional arrays, but I'm
> looking for a more general strategy to use on higher dim arrays.

How about this:

IDL> arr = indgen(3, 3)
IDL> print, arr
0 1 2
3 4 5
6 7 8
IDL> arr = rebin(reform(arr, 3, 3, 1), 3, 3, 2, /sample)
IDL> print, arr
0 1 2
3 4 5
6 7 8

0 1 2
3 4 5
6 7 8

REFORM adds an extra dimension, and REBIN expands the array along the extra
dimension. This will work just fine for higher dimensions.

Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley

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[Message index]

		Re: REPLICATE with arrays By: Craig Markwardt on Fri, 11 February 2000 00:00
		Re: REPLICATE with arrays By: Liam E. Gumley on Fri, 11 February 2000 00:00
		Re: REPLICATE with arrays By: davidf on Fri, 11 February 2000 00:00
		Re: REPLICATE with arrays By: thompson on Fri, 11 February 2000 00:00
		Re: REPLICATE with arrays By: Liam E. Gumley on Fri, 11 February 2000 00:00
		Re: REPLICATE with arrays By: davidf on Fri, 11 February 2000 00:00

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