My purpose is to use norm to describe Euclidean distance，but it does not work ,the code is

for m = 2: M

norm((Q(:,m) - Q(:,m-1))) <= DMax;

end

which Q is 2*M matrix，which stored some two-dimensional coordinates，there have a constraint as follow，I try to use norm to describe it but cvx reject it with error :Illegal operation: {log-affine} - {log-affine},

how can I solve it?thank you sir!