dot calculation

Hi, experts

I am kind of confuse about the syntax in matlab below
p ./ numel(I) --> there is a dot after p
p / numel(I) --> no dot after p

what is the difference between those two? I try couple different p matrix, but I don't see the different in answer.
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if there is dot between two like A./B then matlab divides the two matrices by their entries like A(i,j)/B(i,j)

if there is no dot between A/B  then matlab takes the inverse of B which is equivalent to A*inv(B)


A=[10 12;6 3]

A =

    10    12
     6     3

>> B=[2 4;3 1]

B =

     2     4
     3     1

>> C=A./B

C =

     5(=10/2)     3(=12/4)  
     2     3


D =

    2.6000    1.6000
    0.3000    1.8000

>> D=A*inv(B)

D =

    2.6000    1.6000
    0.3000    1.8000


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