2.1 ADDITION AND SUBTRACTION
matrix相加、减只是简单的值如
VectA=[8 5 4];
VectB=[10 2 7];
2.2 ARRAY MULTIPLICATION
matrix相乘
A*B
要求A的列要等B的行,结果是A行B列。。就是线性代数那种矩阵乘法
2.3 ARRAY DIVISION
matrix相除
Identity matrix 对角线为1,其它为0,行列相同的,是单位矩阵
Inverse matrix A*B=单位矩阵 A和B互为反转矩阵
左除与右除
左除
AX = B
X=A\B
右除
XA = B
X=B/A
2.4 ELEMENT-BY-ELEMENT OPERATIONS
a.*b = [a1*b1 a2*b2 a3*b3 a4*b4]
a./b = [a1/b1 a2/b2 a3/b3 a4/b4]
a.^b = [(a1)b1 (a2)b2 (a3)b3 (a4)b4]
2.5 BUILT-IN FUNCTIONS FOR ANALYZING ARRAYS
略
2.6 RANDOM NUMBERS
rand 创建0到1的随机数
rand(1,n) 创建1行N列0到1的随机数
rand(n) 创建N行N列0到1的随机数
randperm(n) 创建1到N的整数随机数
randi(imax) 创建1到imax的整数随机数
randi(imax,n) 创建1到imax的整数n * n matrix
randi(imax,m,n) 创建1到imax的整数m * n matrix
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