mirror of
https://github.com/boostorg/histogram.git
synced 2025-05-10 07:14:05 +00:00
14f36ea932
* new accmulator examples for user guide * new weighted profile example * minor corrections to other examples
46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
// Copyright 2019 Hans Dembinski
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// (See accompanying file LICENSE_1_0.txt
|
|
// or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
//[ guide_custom_accumulators_3
|
|
|
|
#include <boost/format.hpp>
|
|
#include <boost/histogram.hpp>
|
|
#include <iostream>
|
|
#include <sstream>
|
|
|
|
int main() {
|
|
using namespace boost::histogram;
|
|
|
|
// Make a accumulator which accepts two samples and computes the mean of each.
|
|
struct multi_mean {
|
|
accumulators::mean<> mean_x, mean_y;
|
|
|
|
void operator()(double x, double y) {
|
|
mean_x(x);
|
|
mean_y(y);
|
|
}
|
|
};
|
|
// Note: There are more efficient implementations of this accumulator.
|
|
|
|
// Create a 1D histogram that uses the custom accumulator.
|
|
auto h = make_histogram_with(dense_storage<multi_mean>(), axis::integer<>(0, 2));
|
|
h(0, sample(1, 2)); // samples go to first cell
|
|
h(0, sample(3, 4)); // samples go to first cell
|
|
h(1, sample(5, 6)); // samples go to second cell
|
|
h(1, sample(7, 8)); // samples go to second cell
|
|
|
|
std::ostringstream os;
|
|
for (auto&& x : indexed(h)) {
|
|
os << boost::format("index %i mean_x %.1f mean_y %.1f\n") % x.index() %
|
|
x->mean_x.value() % x->mean_y.value();
|
|
}
|
|
std::cout << os.str() << std::flush;
|
|
assert(os.str() == "index 0 mean_x 2.0 mean_y 3.0\n"
|
|
"index 1 mean_x 6.0 mean_y 7.0\n");
|
|
}
|
|
|
|
//]
|