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- // Copyright 2015-2018 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_histogram_streaming
- #include <boost/histogram.hpp>
- #include <boost/histogram/ostream.hpp>
- #include <cassert>
- #include <iostream>
- #include <sstream>
- #include <string>
- int main() {
- using namespace boost::histogram;
- std::ostringstream os;
- auto h1 = make_histogram(axis::regular<>(5, -1.0, 1.0, "axis 1"));
- h1.at(0) = 2;
- h1.at(1) = 4;
- h1.at(2) = 3;
- h1.at(4) = 1;
- // 1D histograms are rendered as an ASCII drawing
- os << h1;
- auto h2 = make_histogram(axis::regular<>(2, -1.0, 1.0, "axis 1"),
- axis::category<std::string>({"red", "blue"}, "axis 2"));
- // higher dimensional histograms just have their cell counts listed
- os << h2;
- std::cout << os.str() << std::endl;
- assert(
- os.str() ==
- "histogram(regular(5, -1, 1, metadata=\"axis 1\", options=underflow | overflow))\n"
- " +-------------------------------------------------------------+\n"
- "[-inf, -1) 0 | |\n"
- "[ -1, -0.6) 2 |============================== |\n"
- "[-0.6, -0.2) 4 |============================================================ |\n"
- "[-0.2, 0.2) 3 |============================================= |\n"
- "[ 0.2, 0.6) 0 | |\n"
- "[ 0.6, 1) 1 |=============== |\n"
- "[ 1, inf) 0 | |\n"
- " +-------------------------------------------------------------+\n"
- "histogram(\n"
- " regular(2, -1, 1, metadata=\"axis 1\", options=underflow | overflow)\n"
- " category(\"red\", \"blue\", metadata=\"axis 2\", options=overflow)\n"
- " (-1 0): 0 ( 0 0): 0 ( 1 0): 0 ( 2 0): 0 (-1 1): 0 ( 0 1): 0\n"
- " ( 1 1): 0 ( 2 1): 0 (-1 2): 0 ( 0 2): 0 ( 1 2): 0 ( 2 2): 0\n"
- ")");
- }
- //]
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