{

try {

int device = argc > 1 ? atoi(argv[1]) : 0;

af::deviceset(device);

af::info();

int days = 9, sites = 4;

int n = 10; // measurements

float day_[] = {0, 0, 1, 2, 5, 5, 6, 6, 7, 8 }; // ascending

float site_[] = {2, 3, 0, 1, 1, 2, 0, 1, 2, 1 };

float measurement_[] = {9, 5, 6, 3, 3, 8, 2, 6, 5, 10}; // inches

array day(n,day_);

array site(n,site_);

array measurement(n,measurement_);

array rainfall = constant(0, sites);

gfor (seq s, sites) {

rainfall(s) = sum(measurement * (site == s));

}

printf("total rainfall at each site:\n");

af_print(rainfall);

array is_between = 1 <= day && day <= 5; // days 1 and 5

float rain_between = sum<float>(measurement * is_between);

printf("rain between days: %g\n", rain_between);

printf("number of days with rain: %g\n", sum<float>(diff1(day) > 0) + 1);

array per_day = constant(0, days);

gfor (seq d, days)

per_day(d) = sum(measurement * (day == d));

printf("total rainfall each day:\n");

af_print(per_day);

printf("number of days over five: %g\n", sum<float>(per_day > 5));

} catch (af::exception &e) {

fprintf(stderr, "%s\n", e.what());

throw;

}

#ifdef WIN32 // pause in Windows

if (!(argc == 2 && argv[1][0] == '-')) {

std::cout << "hit [enter]...";

fflush(stdout);

getchar();

}

#endif

return 0;