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Re: Adding elements in an Array [message #86000 is a reply to message #85994]

Mon, 23 September 2013 14:35

wlandsman
Messages: 743
Registered: June 2000

Senior Member

OK, here is why I think the behavior of REBIN is intuitive. Like all good IDL explanations it (vaguely) involves HISTOGRAM.

ReBin means to change the binning size. And, as with HISTOGRAM, when you change the binning size, the total sum over all bins must remain the same. When you REBIN a 512 x 512 array to 256 x 256 array, the total amount of "stuff" in the pixels is conserved; it is just distributed over bigger pixels. (To answer Mat's question -- REBIN does *not* do linear interpolation when minifying, it does averaging.)

This gives me a chance to plug one of my favorite programs -- FREBIN
http://idlastro.gsfc.nasa.gov/ftp/pro/image/frebin.pro
This program also conserves the "stuff" in the array, but allows new bin sizes that are not necessarily an integral fraction of the old. --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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