diet.run

Warning

The original AMPL book does not reflect many of the latest features available in AMPL. To programmatically interact with your models you should use APIs such as our popular Python API.

diet.run

model diet.mod;
data diet2.dat;

param N symbolic in NUTR;
param nstart > 0;
param nstep > 0;
read N, nstart, nstep <- ;   # read data interactively

set N_MAX default {};
param N_obj {N_MAX};
param N_dual {N_MAX};
option solver_msg 0;

for {i in nstart .. 0 by -nstep} {
   let n_max[N] := i;
   solve;
   if solve_result = "infeasible" then {
      printf "--- infeasible at %d ---\n\n", i;
      break;
   }
   let N_MAX := N_MAX union {i};
   let N_obj[i] := Total_Cost;
   let N_dual[i] := Diet[N].dual;
}
display N_obj, N_dual;