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Re: how to sort data based on other sorted data [message #58036 is a reply to message #58013]

Sat, 12 January 2008 11:35

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Tom McGlynn <tam@milkyway.gsfc.nasa.gov> writes:
> On Jan 10, 3:51 pm, placebo <willie.mad...@gmail.com> wrote:
>>> try Craig Markwardt's multisort
>>
>>> http://astrog.physics.wisc.edu/~craigm/idl/arrays.html#MULTI SORT
>>
>> Brian,
>>
>> The multisort method works quite well.
>>
> ...
>
> Multisort works fine and knowing Craig will work very robustly
> but I don't think you need to have any limit on
> the number of columns. Below is a routine that should
> be able to handle an arbitrary number of columns and rows...

Hi Tom, thanks for the interesting contribution. I think the essence
of BIGSORT and MULTISORT are similar, namely to build up a surrogate
sort key. MULTISORT does it with strings and BIGSORT does it with
integers. Clearly sorting by integers will be faster.

Incidentally, the MULTISORT limitation of ten sort keys was purely
arbitrary, and it would be trivial to extend. But honestly, who would
need so many sort keys? It's like the people who shop for cameras
these days based on megapixels...

Craig

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[Message index]

		how to sort data based on other sorted data By: placebo on Wed, 09 January 2008 11:24
		Re: how to sort data based on other sorted data By: Tom McGlynn on Sun, 13 January 2008 21:10
		Re: how to sort data based on other sorted data By: Craig Markwardt on Sat, 12 January 2008 11:35
		Re: how to sort data based on other sorted data By: Tom McGlynn on Fri, 11 January 2008 12:24
		Re: how to sort data based on other sorted data By: David Fanning on Fri, 11 January 2008 10:05

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