Removing zeroes from 3d matrrix

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Chris Dan
Chris Dan 2020-6-27
编辑： Matt J 2020-6-27
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..?

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回答（2 个）

Matt J
Matt J 2020-6-27
编辑：Matt J 2020-6-27
reshape(nonzeros(Fx),11,2,3);
Image Analyst
Image Analyst 2020-6-27
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

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