A C++ template library for embedded applications
MIT licensed
Designed and
maintained by
John Wellbelove
Support the development
of the ETL

Variance

20.9.0

template <bool Variance_Type, typename TInput, typename TCalc = TInput>
class variance : public etl::unary_function<TInput, void>

Variance_Type Population or Sample.
TInput        The input data type.
TCalc         The type to use for internal calculations. By default, equal to TInput.
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variance_type
etl::variance_type::Sample    
etl::variance_type::Population
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variance
variance()
Default constructor.

template <typename TIterator>
variance(TIterator first, TIterator last)
Construct from an iterator range.
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void add(TInput value1)
Add a value.

template <typename TIterator>
void add(TIterator first, TIterator last)
Add a range of values.
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void operator()(TInput value)
Add a values.

template <typename TIterator>
void operator()(TIterator first, TIterator last)
Add a range of values.
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double get_variance() const
Returns the calculated variance for the data.
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operator double() const
Returns the calculated variance for the data.
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size_t count() const
Get the total number added entries.
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void clear()
Clear the variance.
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Example

std::array<char, 10> input
{
  0, 1, 2, 3, 4, 5, 6, 7, 8, 9
};

etl::variance<etl::variance_type::Population, char, int32_t> variance(input.begin(),
                                                                      input.end());

double variance_result;

variance_result = variance; // variance_result  == 8.25
variance.h