MATLAB: Could anyone help me to fix the issue.

index exceeds matrix dimensions

code:
a=[1 2;
3 4;
5 6;
7 8]
data=2;
dimension=2;
a=a(:,1+data:dimension+data);
If i run this i am getting index exceeds matrix dimensions
could anyone explain what is meant by index exceeds matrix dimensions and how it can be solved with respect to the above code.

Best Answer

You have two columns in a ...but you are trying to extract four columns...so the error...
a=[1 2;
    3 4;
    5 6;
    7 8]
a=a(:,1:2);   % no error 
a = a(:,2:4) ;  % error
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