unique occurance table from array

2015 3 4
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更新时间：2015 3 4
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I would like to be able to return the count of occurences of each element in a vector.
For example if I have a vector:
x=[10 25 4 10 9 4 4]
I expect the result to be
10 2
25 1
4 3
9 1

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Star Strider
Star Strider 2015-3-4

1 个投票

Use the hist function:
x=[10 25 4 10 9 4 4];
ux = unique(x);
counts = hist(x, ux);
result = [ux' counts']

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Rahul Shelar
Rahul Shelar 2015-3-4
编辑：Rahul Shelar 2015-3-4
Thanks its really working using hist function on octave..... I didnt knew about hist function I ve tried like this y=unique(x); disp(y); m=length(y); n=length(x); disp(n);
a=zeros(m);
for i=1:1:m
for j=1:1:n
if(y(i)==x(j))
a(i)=a(i)+1;
end
end
end
a=a(:,1); disp(a);
I really like ur approach.......
Image Analyst
Image Analyst 2015-3-4
Also learn about its friends like histc() and imhist(). The histogram is like the PDF (probability distribution function), and related to that is the CDF, cumulative distribution function which you can get from passing the counts into cumsum(). By the way, hist() is now deprecated - they tell you to use histogram() instead.
Star Strider
Star Strider 2015-3-4
Note that Rahul Shelar is using Octave.

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