1 // Copyright 2018 Hans Dembinski
2 //
3 // Distributed under the Boost Software License, Version 1.0.
4 // (See accompanying file LICENSE_1_0.txt
5 // or copy at http://www.boost.org/LICENSE_1_0.txt)
6
7 // clang-format off
8
9 //[ getting_started_listing_03
10
11 #include <boost/format.hpp>
12 #include <boost/histogram.hpp>
13 #include <cassert>
14 #include <iostream>
15 #include <sstream>
16
main()17 int main() {
18 using namespace boost::histogram;
19
20 /*
21 Create a profile. Profiles does not only count entries in each cell, but
22 also compute the mean of a sample value in each cell.
23 */
24 auto p = make_profile(axis::regular<>(5, 0.0, 1.0));
25
26 /*
27 Fill profile with data, usually this happens in a loop. You pass the sample
28 with the `sample` helper function. The sample can be the first or last
29 argument.
30 */
31 p(0.1, sample(1));
32 p(0.15, sample(3));
33 p(0.2, sample(4));
34 p(0.9, sample(5));
35
36 /*
37 Iterate over bins and print profile.
38 */
39 std::ostringstream os;
40 for (auto&& x : indexed(p)) {
41 os << boost::format("bin %i [%3.1f, %3.1f) count %i mean %g\n")
42 % x.index() % x.bin().lower() % x.bin().upper()
43 % x->count() % x->value();
44 }
45
46 std::cout << os.str() << std::flush;
47 assert(os.str() == "bin 0 [0.0, 0.2) count 2 mean 2\n"
48 "bin 1 [0.2, 0.4) count 1 mean 4\n"
49 "bin 2 [0.4, 0.6) count 0 mean 0\n"
50 "bin 3 [0.6, 0.8) count 0 mean 0\n"
51 "bin 4 [0.8, 1.0) count 1 mean 5\n");
52 }
53
54 //]
55