find the rank of a matrix 1 4 3 2 1 2 3 1 4 3 1 6 7 2 9 3 3 6 6 12 a −     − − −   =  in matlab

To find the rank of a matrix in MATLAB, you can use the rank function. Here's how you can do it:

main.m
A = [1 4 3 2 1; 2 3 1 4 3; 1 6 7 2 9; 3 3 6 6 12];
rank_A = rank(A);
disp(rank_A);
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In this code snippet, A represents the matrix for which you want to find the rank. The rank function is then used to calculate the rank of matrix A, and the result is stored in rank_A. Finally, disp(rank_A) is used to display the rank of matrix A.