1.特殊矩阵的建立
单位矩阵， 全一矩阵，零矩阵， 随机矩阵，魔方矩阵magic， 希尔伯特矩阵hilb
Generate a 5-by-5 matrix of normally distributed random numbers.
r = randn(5)
Generate a 5-by-5 matrix of uniformly distributed random numbers between 0 and 1.
r = rand(5)
2.矩阵和向量运算
det(A)行列式 inv(A)逆 A'转置
内积计算
a=[1, 2,4];
b=[2,5,8];
s=a*b';或者s=dot(a,b);
3.线性方程组求解
