extract submatrix from a (50,50) matrix in matlab

To extract a submatrix from a (50,50) matrix in matlab, you can use indexing.

main.m
% create a 50x50 random matrix
A = rand(50,50);

% define row and column indices for submatrix
row_indices = 5:15;
col_indices = 10:20;

% extract submatrix
submatrix = A(row_indices, col_indices);
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In the code above, we first create a 50x50 random matrix using the rand function. We then define the row and column indices for the submatrix we want to extract. In this case, we want rows 5-15 and columns 10-20. Finally, we use indexing to extract the submatrix from the original matrix.

Note that you can also extract a row or a column by specifying only one index. For example, to extract the 10th row of the matrix A, you would use A(10,:). Similarly, to extract the 20th column, you would use A(:,20).