cvx_begin
variables x(201) y(201) v(200)
subject to
for i=1:200
v(i) == norm([x1(i+1)-x1(i),y1(i+1)-y1(i)])
end
cvx_end

the output will return an error:Disciplined convex programming error:
Invalid constraint: {real affine} == {convex}
so how to express variable v in DCP ruleset?