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

Hello,

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.

[KALYAN ACHARJYA]

Yes the size of Q is 17019x68x50, what is resultant size as you expected?

Answer 1

[Andrei Bobrov]

Q(Q == 0) = NaN;
out = squeeze(mode(Q));
out(isnan(out)) = 0;

[Daniel Reinowski]

Thank you, that works exactly as desired.