Option 3: accumarray
counts3 = accumarray(M, ones(size(M)), [], @sum); % or simply: accumarray(M, 1);
This approach is not easy to understand. Let’s see what the function accumarry does first. MATLAB help file states that “accumarray groups elements from a data set and applies a function to each group. A = accumarray(subs,val) creates an array A by accumulating elements of the vector val using the elements of subs as indices. The position of an element in subs determines which value of vals it selects for the accumulated vector; the value of an element in subs determines the position of the accumulated vector in the output”.
So what does it mean exactly? Let’s see an example.
subs = [1; 2; 4; 2; 4]; val = ones(1,5); A = accumarray(subs, val) A = 1 % A(1) = val(1) = 101 2 % A(2) = val(2)+val(4) = 1+1 = 2 0 % A(3) = 0 2 % A(4) = val(3)+val(5) = 1+1 = 2
Option 4: sort/diff
[MM idx] = unique( sort(M) ); counts4 = diff([0;idx]);
M = [1; 2; 4; 2; 4; 5; 2]; % input is a column vector [MM idx] = unique( sort(M) ) MM = 1 2 4 5 idx = 1 4 6 7 counts4 = diff([0;idx]) counts4 = 1 3 2 1
counts4 = diff([0 idx])
Part 1: http://nw360.blogspot.com.au/2013/06/count-number-of-elements-in-vector-or.html
Part 2: http://nw360.blogspot.com.au/2013/06/count-number-of-elements-in-vector-or_20.html
Part 3: http://nw360.blogspot.com.au/2013/06/count-number-of-elements-in-vector-or_21.html
References:
1 MATLAB help file.
2 http://stackoverflow.com/questions/2880933/how-can-i-count-the-number-of-elements-of-a-given-value-in-a-matrix
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