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print evaluation count in t_tutorial.cxx #591

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9020c12
print evaluation count in t_tutorial.cxx
stevengj Feb 16, 2025
0018a4c
output more info, make compatible with more algorithms
stevengj Feb 16, 2025
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21 changes: 17 additions & 4 deletions test/t_tutorial.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@
#include <iomanip>
#include <nlopt.hpp>

int count = 0; // counter for objective-function evaluations

double myvfunc(const std::vector<double> &x, std::vector<double> &grad, void *data)
{
(void)data;
Expand All @@ -27,19 +29,29 @@ double myvconstraint(const std::vector<double> &x, std::vector<double> &grad, vo
grad[0] = 3 * a * (a*x[0] + b) * (a*x[0] + b);
grad[1] = -1.0;
}
++count;
return ((a*x[0] + b) * (a*x[0] + b) * (a*x[0] + b) - x[1]);
}


int main(int argc, char *argv[]) {
nlopt::opt opt(argc < 2 ? nlopt::LD_MMA : (nlopt::algorithm)atoi(argv[1]), 2);
const std::vector<double> lb = {-HUGE_VAL, 1e-6};
const double exactmin = 0.544331053951817355154952; // sqrt(8/27)
opt.set_lower_bounds(lb);
opt.set_min_objective(myvfunc, NULL);
my_constraint_data data[2] = { {2,0}, {-1,1} };
opt.add_inequality_constraint(myvconstraint, &data[0], 1e-8);
opt.add_inequality_constraint(myvconstraint, &data[1], 1e-8);
opt.set_xtol_rel(1e-4);

// require convergence to within 1e-3 for user-specified algorithm
if (argc < 2)
opt.set_xtol_rel(1e-4);
else {
opt.set_lower_bounds(1e-6);
opt.set_upper_bounds(10.0);
opt.set_stopval(exactmin + 1e-3);
}

// try setting an algorithm parameter: */
opt.set_param("inner_maxeval", 123);
Expand All @@ -58,9 +70,10 @@ int main(int argc, char *argv[]) {

try{
opt.optimize(x, minf);
std::cout << "found minimum at f(" << x[0] << "," << x[1] << ") = "
<< std::setprecision(10) << minf <<std::endl;
return std::fabs(minf - 0.5443310474) < 1e-3 ? EXIT_SUCCESS : EXIT_FAILURE;
std::cout << opt.get_algorithm_name() << " found minimum at f(" << x[0] << "," << x[1] << ") = "
<< std::setprecision(10) << minf << " = exactmin + " << minf - exactmin
<< " after " << count << " evaluations" << std::endl;
return std::fabs(minf - exactmin) < 1e-3 ? EXIT_SUCCESS : EXIT_FAILURE;
}
catch(std::exception &e) {
std::cerr << "nlopt failed: " << e.what() << std::endl;
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