Removing zeroes from 3d matrrix

Hi,

I want to remove the zeros from a 3D matrix and bring the non zeroes values upwards. I am attaching the picture which will explain more clearly. I dont want to reduce slices..

The zeroes should be removed and non zeroes entries should face each other.

I looked at these links

https://uk.mathworks.com/matlabcentral/answers/32852-shrink-a-1-d-array-vector-by-removing-all-the-columns-with-a-value-of-zero

https://uk.mathworks.com/matlabcentral/answers/503392-remove-zeros-from-a-3d-array

https://uk.mathworks.com/matlabcentral/answers/332758-how-to-remove-zeros-from-a-3d-array

https://uk.mathworks.com/matlabcentral/answers/357349-remove-zeros-from-all-columns-of-a-3d-matrix

But it is not working for me...

does anyone has an idea..?

Answer 1

[Matt J]

reshape(nonzeros(Fx),11,2,3);

Answer 2

[Image Analyst]

You cannot do that for a 3-D matrix. You must have the same number of elements even if you shift things around, unless you have a whole plane in the X, Y, or Z dimension that is all zeros. In that case you can remove a whole plane. Otherwise it's not clear which dimension and direction the column goes and what direction to shift it in.

Your screenshot shows a 2-D matrix, and for that, you can shift one column up if that's what you want to do. Untested code:

[rows, columns, slices] = size(m); % m is your array.
for col = 1 : columns
    thisColumn = m(:, col);
    % Remove zeros
    thisColumn(thisColumn == 0) = [];
    % Erase whole column at first.
    m(:, col) = 0;
    % Put back in the nonzero elements at the top.   
    m(1 : length(thisColumn), col) = thisColumn;
end