use matlab to solve this

3. (Coding) Revise the code of the LU decomposition in HW4 to perform the LU decompo- sition of the following tridiagonal matrix A= [ 1 2 0 0 0 0 2 5 1 0 0 0 0 3 7 2 0 0 0 0 -29 -1 0 0 0 0 3 10 1 | 0 0 0 0 2 20 Express L and U explicitly. Note that the computation of the LU decomposition can be reduced if A is a banded matrix. Submit the code for Problem 3 in the appendix