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index.m - create a list of the indices and values of an array

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index.m - create a list of the indices and values of an array

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04 Sep 2008 (Updated )

Create a list where each value (content) of an array is displayed together with its index.

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Description

This function displays each value of an array together with its index. It is possible to ignore zeros and/or NaNs and/or to sort the list according to value. The values can be integers or floating point numbers.

EXAMPLES:

>> a=[2,3,NaN;1,2,4;7,0,9];

>> index(a,'sorted')

ans =
     3 2 0
     2 1 1
     1 1 2
     2 2 2
     1 2 3
     2 3 4
     3 1 7
     3 3 9
     1 3 NaN

>> index(a,'sorted','nonans','nozeros')

ans =
     2 1 1
     1 1 2
     2 2 2
     1 2 3
     2 3 4
     3 1 7
     3 3 9

MATLAB release MATLAB 7.5 (R2007b)
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Comments and Ratings (2)
26 May 2009 Georg Stillfried

Thank you Jos. Your suggestion is now incorporated in an improved version.

05 Sep 2008 Jos x@y.z

I suggest you look at IND2SUB, which allows for easy vectorization
% START OF CODE
a = [3 2 1 ; 7 0 1 ; NaN -1 Inf] ; % some data
[ind{1:ndims(a)}] = ind2sub(size(a),1:numel(a)) ;
r = [cat(1,ind{:}).' a(:)]
% END OF CODE

and work from that onwards ...
On the good side, at least you provided some help, but take care of a proper H1 line used by LOOKFOR.

Updates
05 Sep 2008

Changed summary to fit into the summary field.

26 May 2009

faster through ind2sub

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