Hello everyone,

I am a newbie and need to help on this question.

When I run this problem in CVX

```
function miup_iter = get_miup(tmup_iter,tup_iter,silay,usernum,W,N0,gi,Eimax,roui,Qimax,si,mi,vilocal,vs)
cvx_begin
variable d
variable miup(1,usernum)
minimize( d + tup_iter + sum(miup(1:usernum))/vs )
subject to
……
for i = 1:usernum
if i == 2
continue;
end
tmup_iter * W * N0 / gi(i) * (exp(miup(i)*(1/(tmup_iter*W)) * log(2)) - 1) * exp(sum(miup(1:i-1)) * (1/(tmup_iter*W)) * log(2) ) + ...
tup_iter * W * N0 / gi(i) * (exp(silay(i)*(1/(tup_iter*W)) * log(2)) - 1) * exp(sum(silay(1:i-1)) * (1/(tup_iter*W)) * log(2) ) <= Eimax(i)
end
cvx_end
```

I received an error about the constraint that"Cannot perform the operation: {convex} .* {log-affine}".I think the constraint is convex.

How can I solve this error?

Thank you