# Disciplined convex programming error: Cannot perform the operation: {convex} ./ {convex}

Sincerely search for help I just have no idea if
R = R+weight(it)*log2(1+pow_abs(H_ef(it,it),2)/(sum_inf+1/SNR));
is a convex function or not. I don’t know how to fix it.
my code is given as follow：

cvx_clear
cvx_begin
variables W(M,K)
expressions H_ef temp_R
Q = Pc+pow_pos(norm(W),2)/eta;
H_ef = HW;
for o =1:K
for it=1:K
for k=1:K
if k~=it
sum_inf = sum_inf+pow_pos(norm(H_ef(it,k)),2);
end
end
R = R+weight(it)log2(1+pow_abs(H_ef(it,it),2)/(sum_inf+1/SNR));
end
temp_R(o) = R;
end
maximize (2
y
sqrt(r) - (y^2)*Q);
subject to
pow_pos(norm(W),2) <= Pmax;
for k=1:K
temp_R(k) >= Rmin;
end
cvx_end
solution(i) = cvx_optval;
W
solution(i)
end

I run my code and i get the error state:Disciplined convex programming error:
Cannot perform the operation: {convex} ./ {convex}

Thanks for help!

Your first step is to prove your optimization problem is convex. if it is not, CVX is not the right tool for it. if it is convex, but you are having difficulty formulating it in compliance with CVX’s DCP rules, then forum readers might be able to help.

fully grateful for your reply! I have difficulty in proving it but i will try. 