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variancef
standard deviation of the values of a vector or matrix
Calling Sequence
s=variancef(x,fre) s=variancef(x,fre,'r') or s=variancef(x,fre,1) s=variancef(x,fre,'c') or s=variancef(x,fre,2)
Arguments
- x
real or complex vector or matrix
Description
This function computes the variance of the values of a
vector or matrix x, each of them counted with a
frequency signaled by the corresponding values of the
integer vector or matrix fre with the same type of
x.
For a vector or matrix x, s=variancef(x,fre) (or
s=variancef(x,fre,'*')) returns in scalar s the
variance of all the entries of x, each value
counted with the multiplicity indicated by the
corresponding value of fre.
s=variancef(x,fre,'r')(or, equivalently,
s=variancef(x,fre,1)) returns in each entry of the row
vector s of type 1xsize(x,'c') the variance of
each column of x, each value counted with the
multiplicity indicated by the corresponding value of
fre.
s=variancef(x,fre,'c')(or, equivalently,
s=variancef(x,fre,2)) returns in each entry of the
column vector s of type size(x,'c') x1 the variance
of each row of x, each value counted with the
multiplicity indicated by the corresponding value of
fre.
Examples
x=[0.2113249 0.0002211 0.6653811;0.7560439 0.9546254 0.6283918] fre=[1 2 3;3 4 3] m=variancef(x,fre) m=variancef(x,fre,'r') m=variancef(x,fre,'c')
Bibliography
Wonacott, T.H. & Wonacott, R.J.; Introductory Statistics, fifth edition, J.Wiley & Sons, 1990.
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