Hi chan,
I understand that you have a 3D matrix X with dimensions [6, 3, 2], and you want to find the maximum value in the first column of each 2D matrix while excluding a specified row.
I assume you want to perform this operation for both matrices along the third dimension of X and that the selected row is consistent across both matrices.
- Select the Row to Exclude: Determine the index of the row you want to exclude. For example, if you want to exclude the second row, set "selectedRow = 2"
- Extract the First Column: For each matrix in the third dimension, extract the first column and exclude the selected row.
selectedRow = 2; % Example: exclude the second row
matrix1 = X(:,:,1);
matrix2 = X(:,:,2);
- Remove the Selected Row: Remove the specified row from the first column of each matrix.
firstColMatrix1 = matrix1(:,1);
firstColMatrix1(selectedRow) = []; % Exclude the selected row
firstColMatrix2 = matrix2(:,1);
firstColMatrix2(selectedRow) = []; % Exclude the selected row
- Find the Maximum Value: Compute the maximum value of the remaining elements in the first column for each matrix.
maxValMatrix1 = max(firstColMatrix1);
maxValMatrix2 = max(firstColMatrix2);
- Display the Results: Output the maximum values for each matrix.
disp(['Maximum in first column of matrix 1 (excluding row ', num2str(selectedRow), '): ', num2str(maxValMatrix1)]);
disp(['Maximum in first column of matrix 2 (excluding row ', num2str(selectedRow), '): ', num2str(maxValMatrix2)]);
Output for a sample matrix generated (using "random" function):
X(:,:,1) =
0.9791 0.4139 0.7391
0.5493 0.4923 0.9542
0.3304 0.6947 0.0319
0.6195 0.9727 0.3569
0.3606 0.3278 0.6627
0.7565 0.8378 0.2815
X(:,:,2) =
0.2304 0.3488 0.7311
0.7111 0.4513 0.1378
0.6246 0.2409 0.8367
0.5906 0.7150 0.1386
0.6604 0.8562 0.5882
0.0476 0.2815 0.3662
Maximum in first column of matrix 1 (excluding row 2): 0.97913
Maximum in first column of matrix 2 (excluding row 2): 0.66044
References:
- Refer to the documentation of "max" for finding maximum values: https://www.mathworks.com/help/matlab/ref/max.html
- Refer to the documentation of "rand" for generating random matrices: https://www.mathworks.com/help/matlab/ref/rand.html
Hope this helps!
