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78 lines
3.2 KiB
C++
78 lines
3.2 KiB
C++
// Copyright 2015-2018 Hans Dembinski
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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//[ getting_started_listing_02
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#include <boost/format.hpp>
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#include <boost/histogram.hpp>
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#include <cassert>
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#include <iostream>
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#include <sstream>
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#include <string>
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namespace bh = boost::histogram;
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int main() {
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/*
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Create a histogram which can be configured dynamically at run-time. The axis
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configuration is first collected in a vector of the boost::histogram::axis::variant
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type, which can hold different axis types (those in its template argument list).
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Here, we use a variant that can store a regular and a category axis.
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*/
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using reg = bh::axis::regular<>;
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using cat = bh::axis::category<std::string>;
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using variant = bh::axis::variant<bh::axis::regular<>, bh::axis::category<std::string>>;
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std::vector<variant> axes;
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axes.emplace_back(cat({"red", "blue"}));
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axes.emplace_back(reg(3, 0.0, 1.0, "x"));
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axes.emplace_back(reg(3, 0.0, 1.0, "y"));
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auto h = bh::make_histogram(std::move(axes)); // passing an iterator range also works
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// fill histogram with data, usually this happens in a loop
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h("red", 0.1, 0.2);
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h("blue", 0.7, 0.3);
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h("red", 0.3, 0.7);
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h("red", 0.7, 0.7);
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/*
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Print histogram by iterating over bins.
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Since the [bin type] of the category axis cannot be converted into a double, it cannot
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be handled by the polymorphic interface of boost::histogram::axis::variant. We use
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boost::histogram::axis::get to "cast" the variant type to the actual category type.
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*/
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const auto& cat_axis = bh::axis::get<cat>(h.axis(0)); // get reference to category axis
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std::ostringstream os;
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for (auto x : bh::indexed(h)) {
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os << boost::format("(%i, %i, %i) %4s [%3.1f, %3.1f) [%3.1f, %3.1f) %3.0f\n") %
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x.index(0) % x.index(1) % x.index(2) % cat_axis.bin(x.index(0)) %
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x.bin(1).lower() % x.bin(1).upper() % x.bin(2).lower() % x.bin(2).upper() %
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*x;
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}
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std::cout << os.str() << std::flush;
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assert(os.str() == "(0, 0, 0) red [0.0, 0.3) [0.0, 0.3) 1\n"
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"(1, 0, 0) blue [0.0, 0.3) [0.0, 0.3) 0\n"
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"(0, 1, 0) red [0.3, 0.7) [0.0, 0.3) 0\n"
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"(1, 1, 0) blue [0.3, 0.7) [0.0, 0.3) 0\n"
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"(0, 2, 0) red [0.7, 1.0) [0.0, 0.3) 0\n"
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"(1, 2, 0) blue [0.7, 1.0) [0.0, 0.3) 1\n"
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"(0, 0, 1) red [0.0, 0.3) [0.3, 0.7) 0\n"
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"(1, 0, 1) blue [0.0, 0.3) [0.3, 0.7) 0\n"
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"(0, 1, 1) red [0.3, 0.7) [0.3, 0.7) 0\n"
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"(1, 1, 1) blue [0.3, 0.7) [0.3, 0.7) 0\n"
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"(0, 2, 1) red [0.7, 1.0) [0.3, 0.7) 0\n"
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"(1, 2, 1) blue [0.7, 1.0) [0.3, 0.7) 0\n"
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"(0, 0, 2) red [0.0, 0.3) [0.7, 1.0) 1\n"
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"(1, 0, 2) blue [0.0, 0.3) [0.7, 1.0) 0\n"
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"(0, 1, 2) red [0.3, 0.7) [0.7, 1.0) 0\n"
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"(1, 1, 2) blue [0.3, 0.7) [0.7, 1.0) 0\n"
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"(0, 2, 2) red [0.7, 1.0) [0.7, 1.0) 1\n"
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"(1, 2, 2) blue [0.7, 1.0) [0.7, 1.0) 0\n");
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}
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//]
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