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Re: uniq -c
From: |
Geraint Paul Bevan |
Subject: |
Re: uniq -c |
Date: |
Fri, 27 Aug 2004 19:42:35 +0100 |
User-agent: |
Mozilla Thunderbird 0.7.1 (X11/20040715) |
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Mike Miller wrote:
| We might consider having a uniq(X) operation that doesn't sort the data.
| We can always do uniq(sort(X)), as in UNIX/Linux. If uniq operated on
| rows of a matrix, that would work for me, but it would probably be most
| useful with column vectors.
|
| Thanks again.
|
| Mike
|
There is probably a more efficient way and uniq(sort()) would be a bit
pointless with this function, but this will create a unique list and the
put it back into the original order:
function y = uniq (x)
~ [s,i] = sort (x);
~ d = [1, (diff (s) != 0)];
~ y = x (sort (i ((i.*d) != 0)));
endfunction
octave> x = round (5 * rand (1, 10))
x =
~ 2 0 4 4 3 3 3 4 5 3
octave> uniq (x)
ans =
~ 2 0 4 3 5
- --
Geraint Bevan
http://www.mech.gla.ac.uk/~gbevan
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-------------------------------------------------------------
- uniq -c, Mike Miller, 2004/08/27
- uniq -c, John W. Eaton, 2004/08/27
- Re: uniq -c, Mike Miller, 2004/08/27
- Re: uniq -c,
Geraint Paul Bevan <=