Extracting histogram each row of matrix

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cem 2019-5-11

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https://ww2.mathworks.cn/matlabcentral/answers/461491-extracting-histogram-each-row-of-matrix

编辑： madhan ravi 2019-5-15

Hi Everyone,

I have a matrix name as input:

A = [0 4; 0 -5; 0 -1; 0 -1; 2 -1; 3 3; 2 4; 4 0; 0 1; 0 -2; 0 -1; 0 -1; 0 -1;2 -1;2 -1;3 3; 2 4; 4 0];

I want to extract histogram analysis each row of "input" according the other rows. I actually wonder frequency of each row according to other rows. How can i do that without a loop?

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madhan ravi 2019-5-11

Don‘t name your variable input!!!

Mohsin Shah 2019-5-15

I am also looking for the same solution.

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Answer 1

Mohsin Shah 2019-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/461491-extracting-histogram-each-row-of-matrix#answer_375061

编辑：madhan ravi 2019-5-15

I hope this will solve your problem.

 A = [0 4; 0 -5; 0 -1; 0 -1; 2 -1; 3 3; 2 4; 4 0; 0 1; 0 -2; 0 -1; 0 -1; 0 -1;2 -1;2 -1;3 3; 2 4; 4 0];
[Mu,ia,ic] = unique(A, 'rows', 'stable'); 
% Unique Values By Row, Retaining Original Order
h = accumarray(ic, 1);  % Count Occurrences
maph = h(ic); % Map Occurrences To ‘ic’ Values
Result = [A, maph]