Extract 3D cells with nonzero elements, from a 3D cell array.

Hi guys! I have binary masks saved in 3D arrays (e.g. Mask(:,:,40), see attached Matlab file) and I want to extract only the 3D cell arrays which contain nonzero elements in a sequential order (e.g. if these are 20, then NMask(:,:,20)). Any ideas would be much appreciated.

[Stephen23]

See Guillaume's answer for a much simpler solution.

Answer 1

[KSSV]

clc; clear all ;
load Mask.mat ;

k = Combinedmask ;
[m,n,p] = size(k) ;
count = 0 ;
for i = 1:p
    ki = k(:,:,i) ;
    if sum(any(ki))~=0
        count = count+1 ;
        iwant{count} = ki ;
    end
end

[George Papas]

That's brilliant, nice and concise Siva, great thanks!

[Stephen23]

There is no point in using a loop to solve this task. See Guillaume's answer for a much simpler solution.

[George Papas]

Thanks Stephen.

Answer 2

[Guillaume]

Well, if you want nice and concise:

filteredmask = Combinedmask(:, :, any(any(Combinedmask, 1), 2))

No need for cell arrays, loops, ifs, etc., just one line.

[George Papas]

Thank you Guillaume, that's true. It works very well and it is really concise indeed!