int main(int argc, char **argv)
{
unsigned n, j, i, sdim;
static double x[MAXDIM];
double testint_sobol = 0, testint_rand = 0;
nlopt_sobol s;
if (argc < 3) {
fprintf(stderr, "Usage: %s <sdim> <ngen>\n", argv[0]);
return 1;
}
nlopt_init_genrand(time(NULL));
sdim = atoi(argv[1]);
s = nlopt_sobol_create(sdim);
n = atoi(argv[2]);
nlopt_sobol_skip(s, n, x);
for (j = 1; j <= n; ++j) {
nlopt_sobol_next01(s, x);
testint_sobol += testfunc(sdim, x);
if (j < 100) {
printf("x[%u]: %g", j, x[0]);
for (i = 1; i < sdim; ++i)
printf(", %g", x[i]);
printf("\n");
}
for (i = 0; i < sdim; ++i)
x[i] = nlopt_urand(0., 1.);
testint_rand += testfunc(sdim, x);
}
nlopt_sobol_destroy(s);
printf("Test integral = %g using Sobol, %g using pseudorandom.\n", testint_sobol / n, testint_rand / n);
printf(" error = %g using Sobol, %g using pseudorandom.\n", testint_sobol / n - 1, testint_rand / n - 1);
return 0;
}
void NLOPT_STDCALL nlopt_srand(unsigned long seed) {
nlopt_srand_called = 1;
nlopt_init_genrand(seed);
}
