A matlab question. THX!

Sorry I forgot to upload first question.

Problem 2: Successive Over-Relaxation Any matrix A can be decomposed into a diagonal, upper and lower part 0 a12 . a1n 011 .a2n 0 a22 .. ..an-1n 121 nl an2...a so that A D+U+L. These matrices are useful for devising different matrix splitting methods. For instance, in the Jacobi method we let A = P+ T where P = D and Problem 2: Successive Over-Relaxation Any matrix A can be decomposed into a diagonal, upper and lower part 0 a12 . a1n 011 .a2n 0 a22 .. ..an-1n 121 nl an2...a so that A D+U+L. These matrices are useful for devising different matrix splitting methods. For instance, in the Jacobi method we let A = P+ T where P = D and