MATLAB: Matlab function

I have write a code to find the first pixel that not equal to zero and store the pixel position to M and N respectively as follow:
 j=1;
    while (j>=1&&j<=size(I,1) )
        for i=1:size(I,2)
            if I(i,j) >= 0
               M=j
               N=i  
            break; 
            else 
            end
        end
        j=j+1;
     end    
where I is the image;
 when the code find the first pixel that not equal to zeros,however , the loop can not stop, the break seems do not help to stop the loop; 
Can you please help me on this?

Best Answer

The break is breaking out of the "for", but then you are still within the "while". You need to set a flag before you break and test it after the "for" loop code, using break when the flag is set.
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