what is wrong in this code in matlab?

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Taleb Almajrbi
Taleb Almajrbi 2011-4-14
hi can you tell me what is wrong in this code becouse o got wrong message which is (??? Undefined function or method 'sqr' for input arguments of type 'double')
for (c1=sqr(features1(:,j)- mean_of_column1); and
p1=0;
p2=0;
for j=1:c
c1=sqr(features1(:,j)- mean_of_column1);
c2=sqr(features2(:,j)- mean_of_column2);
p1=p1+c1;
p2=p2+c2;
end;
denominator=sqrt(p1)* sqrt(p2);

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Matt Fig
Matt Fig 2011-4-14
You probably mean to use the SQRT function to find the square root.
In response to your clarifying comment,
sqr = @(x) x.^2; % Define this first, before you use it!
sqr(5)
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Taleb Almajrbi
Taleb Almajrbi 2011-4-14
hi matt
i got another wrong message which is (??? Error using ==> mtimes
Inner matrix dimensions must agree.) for denominator=sqrt(p1)* sqrt(p2); in the same code.
can you solve it to me?
thanks
Matt Fig
Matt Fig 2011-4-14
Yes, whenever you are working with arrays and need to do element by element multiplication, use this instead:
sqrt(p1).* sqrt(p2); % Notice the .* instead of * only.
The same goes for / and ^.

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