TnFOX: FX::Maths::variance

template<typename type>

type FX::Maths::variance	(	const type *FXRESTRICT	array,
		FXuval	len,
		FXuint	stride = `1`,
		const type *FXRESTRICT	_mean = `0`
	)			throw () `[inline]`

Computes the variance of an array.

Definition at line 1811 of file FXMaths.h.

References mean().

Referenced by stddev(), and variance().

01812     {
01813         type v=0, m=_mean ? *_mean : mean(array, len, stride);
01814         for(FXuval n=0; n<len; n+=stride)
01815         {
01816             const type d=array[n]-m;
01817             v+=d*d;
01818         }
01819         return v/((len/stride)-1);
01820     }