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From: <HIDDEN>
Newsgroups: comp.soft-sys.matlab
Subject: sorting, ranking
Date: Fri, 21 Aug 2009 16:16:03 +0000 (UTC)
Organization: Indiana University
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Xref: news.mathworks.com comp.soft-sys.matlab:565109

Hello All,

I have encountered some weird behavior with matlab when attempting to rank a list of numbers.

lets assume that I generate a vector of random numbers.

K>>A = rand(1,10)*100

A =

Columns 1 through 8

79.2207   95.9492   65.5741    3.5712   84.9129   93.3993   67.8735   75.7740

Columns 9 through 10

74.3132   39.2227

If I then sort these numbers

K>>[V,I] = sort(A)

V =

Columns 1 through 8

3.5712   39.2227   65.5741   67.8735   74.3132   75.7740   79.2207   84.9129

Columns 9 through 10

93.3993   95.9492

I =

4    10     3     7     9     8     1     5     6     2

and wish to obtain their ranking

K>>temp = [1:10]

temp =

1     2     3     4     5     6     7     8     9    10

K>> rank = temp(I)

rank =

4    10     3     7     9     8     1     5     6     2

I should get back a permutation of the vector temp in terms of the ordered indices of sorted values from A, instead this code simply returns the I vector

the correct execution of the command rank = temp(I) should return

rank = [7 10 3 1 8 9 4 6 5 2]

Am I missing something here, or mistaken about how matlab should behave in this case?  Or is there simply a bug?

thanks
```