Question: a MATLAB code to perform PLU factorisation on a 4 x 4 matrix and a code to find the direct solution of Ax = y

a MATLAB code to perform PLU factorisation on a 4x4 matrix
and a code to find the direct solution of Ax = y using the PLU factorisation
Matrix A: [21-12; 45-36; -25-26; 411-48]

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