Originally Posted by

**donnagirl** Hi!

I'm trying to decipher this question so I can manipulate a matrix for LU factorization as well as find the infinity norm and error mag. but I don't how to create the matrix based on the question:

Consider the n x n matrix with entries $\displaystyle A_{ij} = \frac{1}{(i + 2j - 1)}$, set $\displaystyle x = [1,...,1]^T$ , and $\displaystyle b = Ax$. ("b" and "x" are in bold).

I need to work with the 3 x 3, 5 x 5, 10 x 10, and 15 x 15 matrices but how do I find them based on the above?