10.66 variance()

Prototypes		Header File(s)
`double`	`variance(const RWMathVec<double>&)`	`<rw/math/mathvec.h>`
`float`	`variance(const RWMathVec<float>&)`	`<rw/math/mathvec.h>`
`double`	`variance(const RWMathVec<DComplex>&)`	`<rw/math/mathvec.h>`
`double`	`variance(const RWGenMat<double>&)`	`<rw/math/genmat.h>`
`float`	`variance(const RWGenMat<float>&)`	`<rw/math/genmat.h>`
`double`	`variance(const RWGenMat<DComplex>&)`	`<rw/math/genmat.h>`
`double`	`variance(const RWMathArray<double>&)`	`<rw/math/mtharray.h>`
`float`	`variance(const RWMathArray<float>&)`	`<rw/math/mtharray.h>`
`double`	`variance(const RWMathArray<DComplex>&)`	`<rw/math/mtharray.h>`

10.66.1 Description

The function variance() takes a vector or matrix x as an argument and returns its variance y as in:

where <x> is the mean of the vector and N is the length of the vector or the number of rows times columns, in the case of a matrix. Note that this is the biased variance.