How to count frequency of non zero elements col wise

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)

Answer 1

[Stephen23]

>> [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

[Jan]

What a pitty that hist is "not recommended" anymore. Do you knwo a method to process the matrix directly using the modern histcounts or histogram? I miss hist and histc.

But it is still working and nicer than the loop: +1

[Stephen23]

@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.

Answer 2

[Jan]

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