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variance

variance — variance of the values of a vector or matrix

Calling sequence

s=variance(x)  
s=variance(x,'r') or m=variance(x,1)  
s=variance(x,'c') or m=variance(x,2)

Parameters

x : real or complex vector or matrix

Description

This function computes the variance of the values of a vector or matrix x.

For a vector or a matrix x, s=variance(x) returns in the scalar s the variance of all the entries of x.

s=variance(x,'r') (or, equivalently, s=variance(x,1)) is the rowwise variance. It returns in each entry of the row vector s the variance of each column of x.

s=variance(x,'c') (or, equivalently, s=variance(x,2)) is the columnwise standard deviation. It returns in each entry of the column vector s the variance of each row of x.

Examples




x=[0.2113249 0.0002211 0.6653811;0.7560439 0.4453586 0.6283918]
s=variance(x)
s=variance(x,'r')
s=variance(x,'c')

Author

Carlos Klimann

Biblio

Wonacott, T.H. & Wonacott, R.J.; Introductory Statistics, fifth edition, J.Wiley & Sons, 1990.

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