| Re: Inconsistency: "sort" on UNIX <-> Windows [message #20540 is a reply to message #20539] |
Fri, 07 July 2000 00:00  |
Liam E. Gumley
Messages: 378
Registered: January 2000
|
Senior Member |
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Daniel Luebbert wrote:
> I've been using the "sort" routine to sort an 2D-array by increasing
> values of its first column.
> The "sort" routine seems to behave differently in the UNIX and the
> Windows versions of IDL5.3.
>
> Here is a little test routine I wrote:
>
> ;**************************
> pro test_sort
> data = [[1,3], $
> [2,5], $
> [1,4], $
> [4,7], $
> [1,2] $
> ]
>
> print,"original: "
> print,data
> print,"sorted: "
> print,data[*,sort(data[0,*])]
> end
> ;**************************
>
> The result on UNIX (Linux) is what I would expect:
>
> ;**************************
> original:
>
> 1 3
>
> 2 5
>
> 1 4
>
> 4 7
>
> 1 2
>
> sorted:
>
> 1 3
>
> 1 4
>
> 1 2
>
> 2 5
>
> 4 7
>
> ;**************************
>
> BUT: The result on Windows is different:
>
> ;**************************
> original:
> 1 3
> 2 5
> 1 4
> 4 7
> 1 2
> sorted:
> 1 2
> 1 4
> 1 3
> 2 5
> 4 7
> ;**************************
>
> In other words: The "sort" routine on Windows doesn't preserve the
> original order of entries which have the same value (see the 3
> "1"-values in my test data), but apparently rearranges them in a random
> way.
>
> What I'd like to know is:
> How can it be that such a basic routine behaves differently in differnet
> implementations of IDL?
>
> And, more importantly: can anybody tell me how to make the
> Windows-version of "sort" behave correctly,
> without writing my own routine for sorting?
Search for 'BSORT' at
http://www.astro.washington.edu/deutsch/idl/htmlhelp/index.h tml
Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley
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