How can I count the frequency of each element of one vector?

Question

yousef Yousef 2014-4-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/125564-how-can-i-count-the-frequency-of-each-element-of-one-vector

评论： Azzi Abdelmalek 2014-4-13

Hi,I have this code which gives the number of occurrences of each element of w vector in vector y
a= [7     4     9     6     4    10     9     6     7     6]
y=zeros(size(a));
for i=1:length(a)
    y(i)=sum(a==a(i));
end
y = y;
end
 y=[2     2     2     3     2     1     2     3     2     3]
but this result is not enough because I need to know the index along with the number of repartitions.
the result should look like:
element no of repartitions  position1  position2 position3  
  7           2                1           9        0
  4           2                2           5        0
  9           2                3           7        0
  6           3                4           8        10
  10          1                0           0        0

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Answer 1

Azzi Abdelmalek 2014-4-12

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/125564-how-can-i-count-the-frequency-of-each-element-of-one-vector#answer_133185

编辑：Azzi Abdelmalek 2014-4-12

在 MATLAB Online 中打开

a= [7 4 9 6 4 10 9 6 7 6]
[b,idx]=unique(a)
[~,jdx]=sort(idx);
[ii,jj]=histc(a,b)
d=accumarray(jj',(1:numel(jj))',[],@(x) {[x' zeros(1,max(ii)-numel(x))]})
out=[b' ii' cell2mat(d)]
out=out(jdx,:)