用MATLAB实现带状矩阵A的LU分解，参数为A的主对角线元素组成的列向量-A MATLAB implementation by the LU decomposition of banded matrix, the parameters for the A' s main diagonal elements of the column vector

this file is to solve the problem of the tridiagonal and banded systems

Matlab Functions for determining if certaion matrix is: 1) Symmetric 2) Lower/Upper triangular (Unit/Strictly/Non-Strictly) 3) n-Banded 4) (Strictly) Diagonally Dominant 5) Isn t it positive definite

one can see that the pattern corresponding to the finite difference discretization tends to be a banded and highly sparse matrix. The same pattern of matrix resulting from discretization arises when we deal