Problem about max{ concave, constant }

1

Hello , everyone!
I have a problem with the “max” , the error and my code are both as follow:
Do you know how to deal with this problem ? thank you very much!

Error

 Disciplined convex programming error:
    Cannot perform the operation max( {concave}, {constant} )

My code:

for k=1:K
r_p(k,n) = - rel_entr ( 1,1+pk(k,n) ) ;
c_p(k,n) = pk(k,n) - pk_c(k,n) ;
R(k,n) = max ( (r_p(k,n)-c_p(k,n) ) , 0 ) ;
end

for k=1:K
N <= sum ( R_p(k, : ) ); %constraint
end

2

The problem as formulated is not convex and hence you cannot use cvx for the stated problem.

3

OK, thank you very much !