MATLAB: Looks so easy but makes big problems!

if

hi Im an amateur programmer!!!!!!!! take a look at this
        for j=1:b
            if s(i1,j)==s(i2,j)
                v{i1,i2}(1,j)=0;
            end
            if s(i1,j)~=s(i2,j)
                v{i1,i2}(1,j)=1;
            end
            if j==b
                y=sum(v{i1,i2});
            end
            if y==1 && v{i1,i2}(1,j)==1
                w{i3}(h,:)=s(i1,:);
                w{i3}(h,j)=9;
                h=h+1;
             end
          end
when I run it, it has this error: ??? Undefined function or variable 'y' who knows what the problem is????????

Best Answer

If y isn't created until j==b
            if j==b
                y=sum(v{i1,i2});
            end
then for j<b, this line won't be able to find y
if y==1 && v{i1,i2}(1,j)==1
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