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Re: sorting column arrays [message #49154]

Fri, 30 June 2006 09:15

cgguido
Messages: 195
Registered: August 2005

Senior Member

> The last line makes the sort in one go, since SORT doesn't guarantee
> anything about the order of identical elements. You might have to
> adjust the coefficients if your data has a wider range than the sample
> you show.

sort does indeed tend to jumble things up a little, but bsort does the
job right:
http://www.dfanning.com/tips/sort.html.

also, something like this should work....

IDL> d = $
IDL> [[4, 7, 0, 1], $
IDL> [3, 6, 2, 9],$
IDL> [2, 2, 0, 2],$
IDL> [42, 4, 2, 7],$
IDL> [256, 3, 0, 2],$
IDL> [34, 2, 1, 5]]
IDL>
IDL> s1 = bsort(d[1, *])
IDL> s2 = bsort(d[3, s1])
IDL> s3 = bsort(d[2, s1[s2]])
IDL> sd = d[*, s1[s2[s3]]]
IDL>
IDL> print, d, 'sorted by columns 2>3>1', sd
4 7 0 1
3 6 2 9
2 2 0 2
42 4 2 7
256 3 0 2
34 2 1 5
sorted by columns 2>3>1
4 7 0 1
2 2 0 2
256 3 0 2
34 2 1 5
42 4 2 7
3 6 2 9

Gianguido

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[Message index]

		Re: sorting column arrays By: cgguido on Fri, 30 June 2006 09:15
		Re: sorting column arrays By: greg michael on Fri, 30 June 2006 05:30

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