MATLAB: Undefined function or variable ‘m’

errorundefined function or variable

I'm newer using matlab I wrote this code,but i have a error Plz help me,thanks
A=imread('21_training.tif');
B=A(:,:,2);
%opening disk = 3
se=strel('disk',3);
C=imopen(B,se);
%co-occurrence matrix
glcm=graycomatrix(C,'NumLevel',256);
p=glcm/sum(glcm(:));
%mean pi,pj and standard deviation pi,pj (mean pi=mean pj)
for i=1:256
  for j=1:256
      m=m+double(i).*p(i,j);
  end
end
error: Undefined function or variable 'm'

Best Answer

It could help if you could format your code using the {}Code button in the question edit window. the Problem is m is not defined. You have done
m=m+(something)
in the first iteration (i=1 and j=1), matlab tries to add value of double(i).*p(i,j) to m. but it does not know what m is.
Initialize m to something (say 0) and try.
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