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CountVariances.cpp
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CountVariances.cpp
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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 ISIS Rutherford Appleton Laboratory UKRI,
// NScD Oak Ridge National Laboratory, European Spallation Source,
// Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#include "MantidHistogramData/CountVariances.h"
#include "MantidHistogramData/BinEdges.h"
#include "MantidHistogramData/CountStandardDeviations.h"
#include "MantidHistogramData/FrequencyStandardDeviations.h"
#include "MantidHistogramData/FrequencyVariances.h"
namespace Mantid {
namespace HistogramData {
/// Constructs CountVariances from FrequencyVariances and bin width based on
/// BinEdges.
CountVariances::CountVariances(const FrequencyVariances &frequencies, const BinEdges &edges)
: CountVariances(FrequencyVariances(frequencies), edges) {}
/// Move-constructs CountVariances from FrequencyVariances and bin width based
/// on BinEdges.
CountVariances::CountVariances(FrequencyVariances &&frequencies, const BinEdges &edges) {
if (!frequencies)
return;
if (!edges)
throw std::logic_error("CountVariances: Cannot construct from "
"FrequencyVariances -- BinEdges are NULL.");
if ((frequencies.size() + 1) != edges.size())
if (!frequencies.empty() || !edges.empty())
throw std::logic_error("CountVariances: Cannot construct from "
"FrequencyVariances -- BinEdges size does not "
"match.");
// Cannot move frequencies private data since it is of different type.
m_data = frequencies.cowData();
frequencies = Kernel::cow_ptr<HistogramE>(nullptr);
auto &data = m_data.access();
for (size_t i = 0; i < data.size(); ++i) {
const auto width = edges[i + 1] - edges[i];
data[i] *= width * width;
}
}
} // namespace HistogramData
} // namespace Mantid