The variables are lioff and u, and u is a 2*20 column vector, and both sides are convex functions, so I don’t know how to multiply two convex functions. Thank you for your kind reply

```
for i=1:I
for n=1:N
pioff(n,i)=o2*(2^(lioff(n,i)/(B*t0))-1)*(H^2+square_pos(norm(u(:,n)-si(:,i))))/y0;
end
end
```