matble中 .*，.^，./，.\的例子 *

1》 *

*为简单的矩阵乘

举例方便下面与.*的对比

>> a=sqrt(sum(magic(3)))

a =

    3.8730    3.8730    3.8730

>> norms=max(1e-15,a)

norms =

    3.8730    3.8730    3.8730

>> A=full(spdiags(norms',0,3,3))

A =

    3.8730         0         0
         0    3.8730         0
         0         0    3.8730

>> B=ones(3,3)

B =

     1     1     1
     1     1     1
     1     1     1

>> C=A*B

C =

    3.8730    3.8730    3.8730
    3.8730    3.8730    3.8730
    3.8730    3.8730    3.8730

>> C=A.*B

C =

    3.8730         0         0
         0    3.8730         0
         0         0    3.8730