Good morning Matlab, I have a 4D-Double matrix that has this dimension: (5*5*5*30) and I need to convert it into a 2D matrix, I suppose, so the new matrix will only have the 1st Column (:,1) from each five by five matrix stacked horizontally,so the new 2D matrix should be 25 by 30 (25*30) dimension, where each column (:,1:30) is basically extracted from the original matrix (5*5*5*30) matrix. To try to explain this a bit more, I have 30 of: five sets of (5by5) matrices, and I only need the information in the first column of each set of 5*5, hence (25 rows) and 30 columns. Can Someone pleaaaaase point me in the right direction? Thank you SO much! have a great day.