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@(@\newcommand{\R}[1]{ {\rm #1} } \newcommand{\B}[1]{ {\bf #1} } \newcommand{\W}[1]{ \; #1 \; }@)@ This is cppad_mixed--20220519 documentation: Here is a link to its current documentation .
Optimal Solution Returned by optimize_fixed

Syntax
Prototype
Convention
fixed_opt
fixed_lag
fix_con_lag
ran_con_lag
warm_start
trace_vec

Syntax
CppAD::mixed::fixed_solution solution

Prototype 

     struct fixed_solution {
          CppAD::vector<double>       fixed_opt;
          CppAD::vector<double>       fixed_lag;
          CppAD::vector<double>       fix_con_lag;
          CppAD::vector<double>       ran_con_lag;
          warm_start_struct           warm_start;
          CppAD::vector<trace_struct> trace_vec;
     };

Convention
If a Lagrange multiplier is non-zero (zero), the correspond constraint is active (is not active) at the optimal solution. The values specified below are as in the solution return by optimize_fixed.

fixed_opt
The size of this field is n_fixed . It is the final value (optimal value found) for the fixed effects.

fixed_lag
The size of this field is n_fixed . If solution.fixed_lag[i] is greater than zero (less than zero), it is the Lagrange multiplier for the upper (lower) bound for the i-th component of the fixed effects.

fix_con_lag
The size of this field is the number of fixed constraints; i.e., the size of the vector vec returned by the fix_constraint function. If solution.fix_con_lag[i] is greater than zero (less than zero), it is the Lagrange multiplier for the upper (lower) bound for the i-th component of the fixed constraint function.

ran_con_lag
The size of this field is the number of random constraints; i.e., the number of rows in the matrix A_rcv . If solution.ran_con_lag[i] is greater than zero (less than zero), it is the Lagrange multiplier for the upper (lower) bound for the i-th row of the random constraint matrix @(@ A @)@.

warm_start
This warm_start_struct contains the necessary information to continue the ipopt optimization from the current solution; i.e., warm start the optimization.

trace_vec
The i-th element of this vector is a trace_struct with the information corresponding to the i-th iteration of the optimization algorithm.
Input File: include/cppad/mixed/fixed_solution.hpp