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44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
//[ guide_fill_histogram
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#include <boost/histogram.hpp>
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#include <utility>
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#include <vector>
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#include <functional>
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#include <numeric>
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#include <cassert>
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namespace bh = boost::histogram;
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int main() {
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auto h = bh::make_histogram(bh::axis::regular<>(8, 0, 4),
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bh::axis::regular<>(10, 0, 5));
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// fill histogram, number of arguments must be equal to number of axes
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h(0, 1.1); // increases bin counter by one
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h(bh::weight(2), 3, 3.4); // increase bin counter by 2 instead of 1
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// histogram also supports fills from a container of values; a container
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// of wrong size trips an assertion in debug mode
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auto xy1 = std::make_pair(4, 3.1);
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h(xy1);
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auto xy2 = std::vector<double>({3.0, 4.9});
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h(xy2);
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// functional-style processing is also supported
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std::vector<std::pair<int, double>> input_data{
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{0, 1.2}, {2, 3.4}, {4, 5.6}};
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// std::for_each takes the functor by value, we use a reference wrapper
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// to avoid costly copies
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auto h2 = bh::make_histogram(bh::axis::regular<>(8, 0, 4),
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bh::axis::regular<>(10, 0, 5));
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std::for_each(input_data.begin(), input_data.end(),
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std::ref(h2));
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// h2 is filled
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const double sum = std::accumulate(h2.begin(), h2.end(), 0.0);
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assert(sum == 3);
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}
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//]
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