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Re: error with sort [message #18451 is a reply to message #18447]

Mon, 10 January 2000 00:00

landsman
Messages: 93
Registered: August 1991

Member

If you are worried about what SORT does to equal values, you might
instead want to use the program bsort.pro, available at

ftp://idlastro.gsfc.nasa.gov/pub/pro/misc/bsort.pro

This procedure ensures that equal values are always maintained in the
initial order, i.e.

IDL> print,bsort([1,1,1,1,1])
0 1 2 3 4

One place where this procedure is useful is when you are sorting on more
than one parameter. For example, suppose you have a set of
temperature and pressure measurements (T, P), and want the primary sort
to be by temperature -- but whenever temperatures are equal, you want
the values sorted by pressure. One can do this as follows:

i1 = sort(P) ;Secondary sort on pressure
i2 = bsort(T[i1]) ;primary sort on temperature

and i2 will give the desired indexing.
Of course, BSORT will be slower than the intrinsic SORT function.

Wayne Landsman landsman@mpb.gsfc.nasa.gov

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[Message index]

		Re: error with sort By: David L. Keller on Wed, 12 January 2000 00:00
		Re: error with sort By: davidf on Mon, 10 January 2000 00:00
		Re: error with sort By: Liam E. Gumley on Mon, 10 January 2000 00:00
		Re: error with sort By: landsman on Mon, 10 January 2000 00:00
		Re: error with sort By: davidf on Mon, 10 January 2000 00:00
		Re: error with sort By: R.Bauer on Mon, 10 January 2000 00:00
		Re: error with sort By: davidf on Mon, 10 January 2000 00:00
		Re: error with sort By: R.Bauer on Mon, 10 January 2000 00:00

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