902624f557
"In fact, the f(void) style has been called an "abomination" by Bjarne Stroustrup, the creator of C++, Dennis Ritchie, the co-creator of C, and Doug McIlroy, head of the research department where Unix was born."
152 lines
2.5 KiB
C++
152 lines
2.5 KiB
C++
#include <cassert>
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#include <algorithm>
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#include <numeric>
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#include "Histogram.h"
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#include "Util.h"
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namespace Horus {
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HistogramSet::HistogramSet (unsigned size, unsigned range)
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{
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size_ = size;
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hist_.resize (range, 0);
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hist_[0] = size;
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}
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void
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HistogramSet::nextHistogram()
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{
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for (size_t i = hist_.size() - 1; i-- > 0; ) {
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if (hist_[i] > 0) {
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hist_[i] --;
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hist_[i + 1] = maxCount (i + 1);
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clearAfter (i + 1);
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break;
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}
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}
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assert (std::accumulate (hist_.begin(), hist_.end(), 0)
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== (int) size_);
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}
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unsigned
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HistogramSet::operator[] (size_t idx) const
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{
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assert (idx < hist_.size());
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return hist_[idx];
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}
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unsigned
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HistogramSet::nrHistograms() const
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{
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return HistogramSet::nrHistograms (size_, hist_.size());
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}
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void
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HistogramSet::reset()
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{
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std::fill (hist_.begin() + 1, hist_.end(), 0);
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hist_[0] = size_;
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}
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std::vector<Histogram>
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HistogramSet::getHistograms (unsigned N, unsigned R)
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{
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HistogramSet hs (N, R);
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unsigned H = hs.nrHistograms();
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std::vector<Histogram> histograms;
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histograms.reserve (H);
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for (unsigned i = 0; i < H; i++) {
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histograms.push_back (hs.hist_);
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hs.nextHistogram();
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}
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return histograms;
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}
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unsigned
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HistogramSet::nrHistograms (unsigned N, unsigned R)
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{
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return Util::nrCombinations (N + R - 1, R - 1);
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}
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size_t
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HistogramSet::findIndex (
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const Histogram& h,
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const std::vector<Histogram>& hists)
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{
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std::vector<Histogram>::const_iterator it = std::lower_bound (
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hists.begin(), hists.end(), h, std::greater<Histogram>());
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assert (it != hists.end() && *it == h);
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return std::distance (hists.begin(), it);
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}
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std::vector<double>
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HistogramSet::getNumAssigns (unsigned N, unsigned R)
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{
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HistogramSet hs (N, R);
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double N_fac = Util::logFactorial (N);
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unsigned H = hs.nrHistograms();
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std::vector<double> numAssigns;
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numAssigns.reserve (H);
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for (unsigned h = 0; h < H; h++) {
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double prod = 0.0;
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for (unsigned r = 0; r < R; r++) {
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prod += Util::logFactorial (hs[r]);
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}
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double res = N_fac - prod;
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numAssigns.push_back (Globals::logDomain ? res : std::exp (res));
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hs.nextHistogram();
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}
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return numAssigns;
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}
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unsigned
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HistogramSet::maxCount (size_t idx) const
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{
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unsigned sum = 0;
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for (size_t i = 0; i < idx; i++) {
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sum += hist_[i];
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}
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return size_ - sum;
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}
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void
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HistogramSet::clearAfter (size_t idx)
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{
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std::fill (hist_.begin() + idx + 1, hist_.end(), 0);
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}
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std::ostream&
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operator<< (std::ostream& os, const HistogramSet& hs)
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{
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os << "#" << hs.hist_;
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return os;
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}
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} // namespace Horus
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