上三角或下三角矩阵也有大部份的元素不储存值（为0），我们可以将它们使用一维阵列来储存以节省储存空间，而对称矩阵因为对称于对角线，所以可以视为上三角或下三角矩阵来储存。-Upper or lower triangular matrix or a large majority of elements are not stored value (0), we can use them to store a one-dimensional array in order to save storage s

Cholesky-factorize symmetric positive definite 6 x 6 matrix A.

判断矩阵是否是自反的，对称的，离散数学中的二元关系。-Matrix to determine whether it is reflexive and symmetric, Discrete Mathematics in the binary relation.