MATLAB: Reduce 3D array by removing NaN elements

3darraynanreduce

Hi !
I ask you for help in Matlab in order to reduce a 3D array. In column there is three numbers (X,Y,Z coordinates) and each row corresponds to a different point. But these points have to respect a certain condition, otherwise three NaN are stored instead of the coordinates. The third dimension correspond to the time evolution of the coordinates stored in the 2D array.
For exemple:
A(:,:,1) =
     1     2     3
   NaN   NaN   NaN
   NaN   NaN   NaN
A(:,:,2) =
   NaN   NaN   NaN
     1     2     3
   NaN   NaN   NaN
A(:,:,3) =
   NaN   NaN   NaN
   NaN   NaN   NaN
   NaN   NaN   NaN
If I try:
A(any(any(isnan(A),3),2),:,:) = [];
I get:
Empty array: 0-by-3-by-3
Or I would have:
A(:,:,1) =
     1     2     3
   NaN   NaN   NaN
A(:,:,2) =
   NaN   NaN   NaN
     1     2     3
A(:,:,3) =
   NaN   NaN   NaN
   NaN   NaN   NaN
The array is reduced but the shape is the same and I don't lose informations.
Thank your for your help and have a nice day !

Best Answer

Maybe you meant all() instead of any()?
idxToRemove = all(all(isnan(A),3),2);
A(idxToRemove,:,:) = []
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