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how to sort data based on other sorted data [message #58013]

Wed, 09 January 2008 11:24

placebo
Messages: 3
Registered: January 2008

Junior Member

Hello all,

I have an input file containing coordinate data (three columns) with a
couple thousand rows. In order to keep this post short lets say the
data file has 8 coordinates scrambled in the list, and I want to sort
it first by the 'z' coordinate (3rd column) then by the 'y' coordinate
(2nd column) then finally by the 'x' column. for example:

unsorted:
x y z
- - -
2 1 2
1 2 2
2 1 1
1 1 1
1 2 1
2 2 2
1 1 2
2 2 1

sorted:
1 1 1
2 1 1
1 2 1
2 2 1
1 1 2
2 1 2
1 2 2
2 2 2

I've already written a routine that will perform this calculation but
it involves using 3 nested FOR loops. So, here's a challenge to you
all. Can you figure out a way to do this without using any FOR loops?

Cheers,

Placebo

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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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