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#ifndef _BLASR_VARIANCE_ACCUMULATOR_IMPL_HPP_
#define _BLASR_VARIANCE_ACCUMULATOR_IMPL_HPP_
template <typename T>
VarianceAccumulator<T>::VarianceAccumulator()
{
Reset();
}
template <typename T>
void VarianceAccumulator<T>::Reset()
{
sumSqVal = 0;
sumVal = 0;
nSamples = 0;
maxVal = minVal = 0;
}
template <typename T>
T VarianceAccumulator<T>::GetMean()
{
return ((1.0) * sumVal) / nSamples;
}
template <typename T>
T VarianceAccumulator<T>::GetVariance()
{
return (1.0 * sumSqVal) / nSamples - GetMean() * GetMean();
}
template <typename T>
float VarianceAccumulator<T>::GetNStdDev(T value)
{
T variance = GetVariance();
T mean = GetMean();
if (variance > 0) {
return std::fabs(value - mean) / (std::sqrt(variance));
} else {
return 0;
}
}
template <typename T>
void VarianceAccumulator<T>::Append(T v)
{
if (nSamples == 0) {
maxVal = minVal = v;
} else {
if (maxVal < v) {
maxVal = v;
}
if (minVal > v) {
minVal = v;
}
}
sumSqVal += v * v;
sumVal += v;
nSamples++;
}
#endif
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