acd5d9979f
As part of the on-going refactor efforts for the source files in src/ipa/raspberrypi/, switch all C++ style comments to C style comments. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2019, Raspberry Pi (Trading) Limited
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*
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* histogram.hpp - histogram calculation interface
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*/
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#pragma once
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#include <stdint.h>
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#include <vector>
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#include <cassert>
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/*
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* A simple histogram class, for use in particular to find "quantiles" and
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* averages between "quantiles".
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*/
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namespace RPiController {
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class Histogram
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{
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public:
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template<typename T> Histogram(T *histogram, int num)
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{
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assert(num);
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cumulative_.reserve(num + 1);
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cumulative_.push_back(0);
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for (int i = 0; i < num; i++)
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cumulative_.push_back(cumulative_.back() +
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histogram[i]);
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}
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uint32_t bins() const { return cumulative_.size() - 1; }
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uint64_t total() const { return cumulative_[cumulative_.size() - 1]; }
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/* Cumulative frequency up to a (fractional) point in a bin. */
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uint64_t cumulativeFreq(double bin) const;
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/*
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* Return the (fractional) bin of the point q (0 <= q <= 1) through the
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* histogram. Optionally provide limits to help.
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*/
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double quantile(double q, int first = -1, int last = -1) const;
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/* Return the average histogram bin value between the two quantiles. */
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double interQuantileMean(double qLo, double qHi) const;
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private:
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std::vector<uint64_t> cumulative_;
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};
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} /* namespace RPiController */
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