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# Extracting histogram each row of matrix

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cem on 11 May 2019
Edited: madhan ravi on 15 May 2019
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?

#### 2 Comments

madhan ravi on 11 May 2019
Don‘t name your variable input!!!
Mohsin Shah on 15 May 2019
I am also looking for the same solution.

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### Answers (2)

gonzalo Mier on 11 May 2019

#### 1 Comment

cem on 12 May 2019
I actually read histogram and I could not understand how am I calculate histogram of two element according to others.

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Mohsin Shah on 15 May 2019
Edited: madhan ravi on 15 May 2019
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]

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