| Inconsistency: "sort" on UNIX <-> Windows [message #20542] |
Fri, 07 July 2000 00:00  |
Daniel Luebbert
Messages: 6
Registered: May 2000
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Junior Member |
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Hi,
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?
THanks for any hint,
Daniel
--
------------------------------------------------------------ ------------
Dr. Daniel L�bbert
Stanford Synchrotron Radiation Laboratory (SSRL)
Bldg. 137, Mailstop 69, 2575 Sandhill Road, Menlo Park, CA 94025, USA
Phone: (650) 926-4010 FAX: (650) 926-4100
luebbert@slac.stanford.edu
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