How to solve this question?

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Shun Weng
Shun Weng 2015-10-18
评论： dpb 2015-10-18
Write an m-file function called lup_decomp.m that decomposes a matrix A into L, U, and P. U is found using Gaussian Elimination with partial pivoting.
To find P and L:
(1) Start with P = I, and L = 0
(2) We set the elements of L as we do in L U decomposition (using the factors calculated from Gaussian Elimination).
(3) Whenever we swap rows during the course of partial pivoting, we also swap the same rows in L and P.
(4) When we are all finished, we set the diagonal elements of L to 1.
Inputs: A The matrix to decompose
Outputs:
L The lower triangular matrix
U The upper triangular matrix
P The permutation matrix
Yes, this is a homework problem. I'm not asking for answer but some tips on how to solve this cause I don't even know where to start.
  1 个评论
dpb
dpb 2015-10-18
Well, certainly you must know the first line...and certainly 1). Then one would presume if you've been doing the homework up to now you've already got the routine needed for 2)...

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