MATLAB: Array indices must be positive integers or logical values (image processing)

image processingmatrixmatrix array

x = imread('cameraman.jpg');
[M,N]=size(x)
for i=1:M
    for j=1:N
        I=x(i,j);
        x(i,j)=xL(I)+( L(I)*lambda(i,j) );   
    end
end
where
xL is 1×256 dimension, xL is 1×256 dimension, and lambda is 256×256 dimension which is same with x that has 256×256 dimension.
I get this error:
Array indices must be positive integers or logical values.
Error in edge_enhancing (line 134)
            x(i,j)=xL(I)+( L(I)*lambda(i,j) );
Ple

Best Answer

I=x(i,j);   % here I will be pixel value of image, it cannot be a index
x(i,j)=xL(I)+( L(I)*lambda(i,j) );
Note that in MATLAB indices should be positive integers or logicals. 
A = rand(10) ; 
A(1)  % no error 


A(10)  % no error 
A(5,4)  % no error 
A(-1)   % error 

A(0)    % error 
A(23.5)   % error
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