Disciplined convex programming error:
Illegal operation: {invalid} - {constant}
出错 - (line 21)
z = plus( x, y, true, cheat );
出错 parameter_setting (line 103)
R_sub1=log2(1+A/u(ii,iter)) -B*(u1(ii)-u(ii,iter));
One of the input data on the right-hand-side is NaN or -Inf or Inf.
Input data being NaN can happen if you use the results of one problem as input data to another problem, but the first problem did not solve to otimality; hence the “optimal” values of its CVX variables are NaN.
Is u(ii,iter) the variable?
If u is variable, it can not be expressed by log2(1+A/u(ii,iter)) .
With regard to log(), you can refer to this link— https://ask.cvxr.com/t/cvxquad-how-to-use-cvxquads-pade-approximant-instead-of-cvxs-unreliable-successive-approximation-for-gp-mode-log-exp-entr-rel-entr-kl-div-log-det-det-root
there are some expression which can’t be express by CVX directly.