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Creating a 2D matrix of non-zero modes from a 3D array

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I have a large 3D array Q (17019x68x50).
I'd like to create a new 2D matrix modeQ which is 68x50 (i.e. the latter two dimesions), with the values being the modes of each corresponding column in the array.
I'm interested only in non-zero modes, but other values are much less frequent than zero, so mode(Q,1) throws out a matrix of only zeroes.
I do not understand the nonzeros function enough to utilise it correctly either.

  1 Comment

KALYAN ACHARJYA on 26 Nov 2019
Yes the size of Q is 17019x68x50, what is resultant size as you expected?

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Accepted Answer

Andrei Bobrov
Andrei Bobrov on 26 Nov 2019
Q(Q == 0) = NaN;
out = squeeze(mode(Q));
out(isnan(out)) = 0;

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