1 // Copyright 2015-2018 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 //[ guide_histogram_streaming
8
9 #include <boost/histogram.hpp>
10 #include <boost/histogram/ostream.hpp>
11 #include <cassert>
12 #include <iostream>
13 #include <sstream>
14 #include <string>
15
main()16 int main() {
17 using namespace boost::histogram;
18
19 std::ostringstream os;
20
21 auto h1 = make_histogram(axis::regular<>(5, -1.0, 1.0, "axis 1"));
22 h1.at(0) = 2;
23 h1.at(1) = 4;
24 h1.at(2) = 3;
25 h1.at(4) = 1;
26
27 // 1D histograms are rendered as an ASCII drawing
28 os << h1;
29
30 auto h2 = make_histogram(axis::regular<>(2, -1.0, 1.0, "axis 1"),
31 axis::category<std::string>({"red", "blue"}, "axis 2"));
32
33 // higher dimensional histograms just have their cell counts listed
34 os << h2;
35
36 std::cout << os.str() << std::endl;
37
38 assert(
39 os.str() ==
40 "histogram(regular(5, -1, 1, metadata=\"axis 1\", options=underflow | overflow))\n"
41 " +-------------------------------------------------------------+\n"
42 "[-inf, -1) 0 | |\n"
43 "[ -1, -0.6) 2 |============================== |\n"
44 "[-0.6, -0.2) 4 |============================================================ |\n"
45 "[-0.2, 0.2) 3 |============================================= |\n"
46 "[ 0.2, 0.6) 0 | |\n"
47 "[ 0.6, 1) 1 |=============== |\n"
48 "[ 1, inf) 0 | |\n"
49 " +-------------------------------------------------------------+\n"
50 "histogram(\n"
51 " regular(2, -1, 1, metadata=\"axis 1\", options=underflow | overflow)\n"
52 " category(\"red\", \"blue\", metadata=\"axis 2\", options=overflow)\n"
53 " (-1 0): 0 ( 0 0): 0 ( 1 0): 0 ( 2 0): 0 (-1 1): 0 ( 0 1): 0\n"
54 " ( 1 1): 0 ( 2 1): 0 (-1 2): 0 ( 0 2): 0 ( 1 2): 0 ( 2 2): 0\n"
55 ")");
56 }
57
58 //]
59