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boost::histogram::algorithm::reduce — Shrink, slice, and/or rebin axes of a histogram.
// In header: <boost/histogram/algorithm/reduce.hpp> template<typename Histogram, typename Iterable> decltype(auto) reduce(const Histogram & hist, const Iterable & options);
Returns the reduced copy of the histogram.
Shrinking only works with axes that accept double values. Some axis types do not support the reduce operation, for example, the builtin category axis, which is not ordered. Custom axis types must implement a special constructor (see concepts) to be reducible.
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