count ranks in specific row/column

Question

Brian Dowling 2020-4-21

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评论： Brian Dowling 2020-4-21

I have a PxQxN matrix.

I need to count the number of non zero cells in each cell PQ as some of them have n<N due to incomplete test data.

I need it to produce another PxQ array of counts n for each PQ cell. I have already preallocated this matrix, I just need to refll the data

Any help would be appreciated.

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Answer 1

Tommy 2020-4-21

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Is something like this what you mean?

% sample PxQxN array:
P = 5; Q = 6; N = 10;
A = num2cell(randi([1 10], P, Q, N));
% set 15 random spots to 0:
for i = 1:15
    A{randi(P), randi(Q), randi(N)} = 0;
end
% count number of nonzero elements in each A(P,Q,:):
C = sum(cellfun(@(c) c~=0, A), 3)
C =
     8     9    10     8     9    10
    10    10    10     8    10    10
    10    10    10     9    10     9
    10    10     9    10    10     9
     9     8    10    10    10    10