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Re: Adding elements in an Array [message #85989 is a reply to message #85987]

Mon, 23 September 2013 13:40

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Monday, September 23, 2013 4:31:00 PM UTC-4, David Fanning wrote:

>
> Do you know this to be true, or are you just taking their word for it?

I use this property of REBIN() all the time because astronomers are often interested in preserving the surface flux when resizing images. And one can do a quick test by resizing to one element.

IDL> print,rebin([2.5,3.2,3.6,9.99],1)
4.82250
IDL> print,mean([2.5,3.2,3.6,9.99])
4.82250

Perhaps you are thinking of CONGRID() which does default to nearest neighbor sampling? --Wayne

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[Message index]

		Adding elements in an Array By: bhattacharjee12 on Sun, 22 September 2013 11:31
		Re: Adding elements in an Array By: David Fanning on Sun, 22 September 2013 11:46
		Re: Adding elements in an Array By: bhattacharjee12 on Sun, 22 September 2013 12:13
		Re: Adding elements in an Array By: natha on Mon, 23 September 2013 10:46
		Re: Adding elements in an Array By: wlandsman on Mon, 23 September 2013 11:30
		Re: Adding elements in an Array By: David Fanning on Mon, 23 September 2013 12:37
		Re: Adding elements in an Array By: wlandsman on Mon, 23 September 2013 13:14
		Re: Adding elements in an Array By: David Fanning on Mon, 23 September 2013 13:31
		Re: Adding elements in an Array By: David Fanning on Mon, 23 September 2013 13:36
		Re: Adding elements in an Array By: Mats Löfdahl on Mon, 23 September 2013 13:48
		Re: Adding elements in an Array By: David Fanning on Mon, 23 September 2013 13:51
		Re: Adding elements in an Array By: Mats Löfdahl on Mon, 23 September 2013 13:54
		Re: Adding elements in an Array By: David Fanning on Mon, 23 September 2013 14:01
		Re: Adding elements in an Array By: Mats Löfdahl on Mon, 23 September 2013 14:10
		Re: Adding elements in an Array By: David Fanning on Mon, 23 September 2013 14:15
		Re: Adding elements in an Array By: Mats Löfdahl on Mon, 23 September 2013 14:16
		Re: Adding elements in an Array By: David Fanning on Mon, 23 September 2013 14:20
		Re: Adding elements in an Array By: David Fanning on Mon, 23 September 2013 14:25
		Re: Adding elements in an Array By: wlandsman on Mon, 23 September 2013 17:56
		Re: Adding elements in an Array By: wlandsman on Mon, 23 September 2013 14:35
		Re: Adding elements in an Array By: Mats Löfdahl on Mon, 23 September 2013 18:50
		Re: Adding elements in an Array By: wlandsman on Mon, 23 September 2013 13:40
		Re: Adding elements in an Array By: David Fanning on Mon, 23 September 2013 13:44

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