arrayfire/examples/getting_started/rainfall.cpp at master · AMD-Ecosystem/arrayfire · GitHub

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/*******************************************************

* This file is distributed under 3-clause BSD license.

* The complete license agreement can be obtained at:

* http://arrayfire.com/licenses/BSD-3-Clause

********************************************************/

// Investigate rainfall measurements across sites and days

// demonstrating various simple tasks

// Compute various values:

// - total rainfall at each site

// - rain between days 1 and 5

// - number of days with rain

// - total rainfall on each day

// - number of days with over five inches

// - total rainfall at each site

// note: example adapted from

// "Rapid Problem Solving Using Thrust", Nathan Bell, NVIDIA

#include <arrayfire.h>

#include <stdio.h>

#include <af/util.h>

#include <cstdlib>

using namespace af;

int main(int argc, char **argv) {

try {

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

af::setDevice(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;

}

return 0;

}

arrayfire/examples/getting_started/rainfall.cpp at master · AMD-Ecosystem/arrayfire · GitHub

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