Matlab newbie - what is wrong with this script?

2013 3 27
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I am just learning Matlab so go easy on me. Trying to figure out what is wrong with this script specifically under the "if" statement is where I seem to be having the most problems.
NUM=0;
for i=1:13
img(:,:,i)=read_LUM2;
if exist('Left','var')==0; {
Left=img;
Left(Left<400)=0;
Left(Left~=0)=1;
Left=logical(Left);
NUM=NUM+1;
L(NUM)=mean2(img(Left));
}
else {
Right=img;
Right(Right<400)=0;
Right(Right~=0)=1;
Right=logical(Right);
NUM=NUM+1;
R(NUM)=mean2(img(Right));
}
end
end
L=L(1:13)';
R=R(1:13)';
any help you can provide will be much appreciated!
Thanks!

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