Mode in Matlab
Started by tlakhankar ●July 22, 2004
Hi,
Do any body know, How to find out mode (most occuring number in
array/matrix) in Matlab?
Or do you have program code to find mode?
Regards,
Tarendra Lakhankar


Posted by Jeff Winter ●July 22, 2004
Hi,
The following code was posted to Matlab Central, by Michael Robbins:
(http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectIdR
66&objectType=file)
function y=mode(x)
% MODE finds the mode of a sample. The mode is the
% observation with the greatest frequency.
%
% i.e. in a sample x=[0, 1, 0, 0, 0, 3, 0, 1, 3, 1, 2, 2, 0, 1]
% the mode is the most frequent item, 0.
% IT'S NOT FANCY BUT IT WORKS
% Michael Robbins
%
%
[b,i,j] = unique(x);
[m,k]=max(hist(j,length(b)));
y=b(k);
Jeff
Original Message
From: tlakhankar [mailto:]
Sent: Wednesday, July 21, 2004 10:03 PM
To:
Subject: [matlab] Mode in Matlab
Hi,
Do any body know, How to find out mode (most occuring number in
array/matrix) in Matlab?
Or do you have program code to find mode?
Regards,
Tarendra Lakhankar
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Posted by tArAng ●July 23, 2004
Tarendra
There mite be a function to do that, heres how i would have done it.
few assumptions that have gone
lets say X is the array in which you want to find mode.
fnd histogram of that array. Thing you should take care is the number of buckets
you are going to use. for e.g. if range of number is from 1  100
integers then number of buckets would be 100.
code would be something like this
X = 100 *rand(1,1000);
X = round(X); % range will be from 0  100. in discrete steps of 1.
Y = hist(X,101);
Index = find( Y == max(Y));
Index variable will contain all the index (i.e number ) which appears
maximum number of time.
I understand this is round about and crude way of finding that number. Also you
may have to modify the code to suit ur application.
Hope this helps
Tarang
On Thu, 22 Jul 2004 tlakhankar wrote : >Hi,
>Do any body know, How to find out mode (most occuring number in
>array/matrix) in Matlab?
>Or do you have program code to find mode?
>Regards,
>Tarendra Lakhankar
>_____________________________________
>Note: If you do a simple "reply" with your email client, only the
author of this message will receive your answer. You need to do a
"reply all" if you want your answer to be distributed to the entire
group.
>_____________________________________
>About this discussion group:
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>To Post: m...@yahoogroups.com
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>Archives:
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>
>Yahoo! Groups Links
>To BR>
>.
>
Tarang Dadia
Graduate Student
Wireless Networking Lab
University of Texas at Arlington. 
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