How to count frequency of non zero elements col wise
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Vishal Sharma
il 30 Giu 2017
Commentato: Stephen23
il 30 Giu 2017
I have a matrix
A = [
1 2 3 0 0;
2 2 0 2 1;
1 0 2 3 1]
I want to count column wise frequency of occurrence of all non zero numbers, i.e. 1, 2, 3 So as to get result in form of
First Col 1 (2) 2(1) 3(0)
Second Col 1(0) 2(2) 3(0)
Third Col 1(0) 2(1) 3(1)
Forth Col 1(0) 2(1) 3(1)
Fifth Col 1(2) 2(0) 3(0)
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Stephen23
il 30 Giu 2017
Modificato: Stephen23
il 30 Giu 2017
>> [N,C] = hist(A,0:3);
>> Z = N(C~=0,:).'
Z =
2 1 0
0 2 0
0 1 1
0 1 1
2 0 0
2 Commenti
Stephen23
il 30 Giu 2017
@Jan Simon: as I only have access to older MATLAB versions this topic has not yet come up for me... and why they needed to be replaced is not really very clear to me either.
Più risposte (1)
Jan
il 30 Giu 2017
Modificato: Jan
il 30 Giu 2017
A = [1 2 3 0 0; ...
2 2 0 2 1; ...
1 0 2 3 1];
nCol = size(A, 2);
Edges = [unique(A(A ~= 0)); Inf];
Result = struct('N', cell(1, nCol));
for k = 1:nCol
Result(k).N = histcounts(A(:, k), Edges);
end
Or
Result = zeros(numel(Edges) - 1, nCol);
for k = 1:nCol
Result(:, k) = histcounts(A(:, k), Edges);
end
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