Code Showing "Undefined function or variable 'q'. Error in test (line 66) if(c~=q) " error Please help

Line 65 to 70 is shown below

for r=1:1:c

if(r~=q)

w=refweight*p(r)*1/p(q);

disp(w)

end

end

Why is it showing "Undefined function or variable 'q'. Error in test (line 66) if(c~=q) " ??

Answer 1

[Chance]

 From all that you've shown you never defined q as anything. Either variables being used must be defined and of same length (or one  of them be a constant) before the logical test (~=,<=,ect) can be performed.