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dot calculation

Posted on 2007-04-09
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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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Question by:rmtogether
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by:MacroLand
ID: 18904047
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)

Regards,
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MacroLand earned 2000 total points
ID: 18904066
Example;

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=A/B

D =

    2.6000    1.6000
    0.3000    1.8000

>> D=A*inv(B)

D =

    2.6000    1.6000
    0.3000    1.8000

Regards,
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