How to change certain values in a 3 layer matrix and fill in another matrix?

Kshitij Singh answered . 2025-08-26 04:30:31

Here is the code in case anyone runs into this problem in the future:

[numRows, numCols] = size(NDVI); % matrix size
NDVII = zeros(numRows, numCols, 3); % zero filled array called NDVII with 3 layers

for j = 1:numCols % counter 'j' is going through each column
     for i = 1:numRows % counter 'i' is going through each row
         if NDVI(i, j) > 0
             NDVII(i, j, :) = G(i, j); % ':' goes through all 3 layers
             NDVII(i, j, 2) = 1; % makes it green
         elseif NDVI(i, j) < 0
             NDVII(i, j, :) = B(i, j);
             NDVII(i, j, 3) = 1; % makes it blue
         end
     end
 end

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