.*运算符是将2个规格相同的矩阵中各元素相乘,所得矩阵规格不变。
>> a = [1,2,3;4,5,6;7,8,9];
>> c = [1;2;3];
>> d = a .'*c;
>>
>>
>> a
a =
1 2 3
4 5 6
7 8 9
>>
>> c
c =
1
2
3
>> d
d =
30
36
42
>> e = a .* a;
>> f = a' .*c;
>> g = a' *c;
>> e =
1 4 9
16 25 36
49 64 81
>> f
f =
1 4 7
4 10 16
9 18 27
>> g
g =
30
36
42
.' * 运算符与' .*运算符结果相同。