Re: Cell arrays of strings in "sort" and "unique"

[Quentin Spencer]

David Bateman wrote:

> I have a problem in implementing the "descend" flag. Where are the
>
> NaN's sorted? As this was introduced in R14, which I don't have access
> to.. So I need some one to run the example
>
> x = [Inf, NaN, -Inf, 3, 2, 1];
> [a, ai] = sort (x, "ascend")
> [a, ai] = sort (x, "descend")
> x = [Inf, NaN, -Inf, 3, 2, 1I];
> [a, ai] = sort (x, "ascend")
> [a, ai] = sort (x, "descend")
>  

Output from MATLAB R14:



>> x = [Inf, NaN, -Inf, 3, 2, 1];
>> [a, ai] = sort (x, 'ascend')

a =

 -Inf     1     2     3   Inf   NaN


ai =

    3     6     5     4     1     2

>> [a, ai] = sort (x, 'descend')

a =

  NaN   Inf     3     2     1  -Inf


ai =

    2     1     4     5     6     3
/home/qspencer> mat
Warning: Could not query OpenGL.
Warning: OpenGL appears to be installed incorrectly.

                             < M A T L A B >
                 Copyright 1984-2004 The MathWorks, Inc.
                        Version 7.0.0.19901 (R14)
                              May 06, 2004


 To get started, type one of these: helpwin, helpdesk, or demo.
 For product information, visit www.mathworks.com.

>> x = [Inf, NaN, -Inf, 3, 2, 1];
>> [a, ai] = sort (x, 'ascend')

a =

 -Inf     1     2     3   Inf   NaN


ai =

    3     6     5     4     1     2

>> [a, ai] = sort (x, 'descend')

a =

  NaN   Inf     3     2     1  -Inf


ai =

    2     1     4     5     6     3

>> x = [Inf, NaN, -Inf, 3, 2, 1i];
>> [a, ai] = sort (x, 'ascend')

a =

 Columns 1 through 4

       0 + 1.0000i   2.0000             3.0000                Inf

 Columns 5 through 6

    -Inf                NaN


ai =

    6     5     4     1     3     2

>> [a, ai] = sort (x, 'descend')

a =

 Columns 1 through 4

     NaN               -Inf                Inf             3.0000

 Columns 5 through 6

  2.0000                  0 + 1.0000i


ai =

    2     3     1     4     5     6