how to resolve this error "subscript indices must either be real positive integers or logicals"

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hi,

Following is the code of Contrast limited histogram Equalization (CLAHE),

 [m,n]=size(yy);
NrX=8;NrY=8;
XSize=floor(m/NrX);
YSize=floor(n/NrY);
NrBins=256;
Min=min(yy(:));
Max=max(yy(:));
 LUT=makeLUT(Min,Max,NrBins);
% avgBin = NrPixels/NrBins;
 Bin=1+LUT(round(yy));

where make makeLUT function is this

 function [LUT] = makeLUT(Min,Max,NrBins)
%  To speed up histogram clipping, the input image [Min,Max] is scaled down to
%  [0,uiNrBins-1]. This function calculates the LUT.
 Max1 = Max + max(1,Min) - Min;
 Min1 = max(1,Min);
 BinSize = fix(1 + (Max - Min)/NrBins);
 LUT = zeros(fix(Max - Min),1);
 for i=Min1:Max1
    LUT(i) = fix((i - Min1)/BinSize);
end