stdevf
standard deviation
Syntax
s = stdevf(x,fre) s = stdevf(x, fre, orientation)
Arguments
- x
real or complex vector or matrix
- fre
real or complex vector or matrix
- orientation
index of the dimension along which the stdevf is computed. It can be either
- a character
"*"
(default),"r"
or"c"
- a positive integer: 1 or 2. 1 is equivalent to "r" and 2 is equivalent to "c".
- a character
- s
real or complex scalar or vector
Description
This function computes the standard deviation of the
values of a vector or matrix x
, each of them
counted with a frequency given by the corresponding
values of the integer vector or matrix fre
who
has the same type of x
.
For a vector or matrix x
, s = stdevf(x,fre) (or
s = stdevf(x,fre,'*')
returns in scalar s
the standard deviation of all the entries of x
,
each value counted with the multiplicity indicated by
the corresponding value of fre
.
s = stdevf(x,fre,'r')
(or, equivalently,
s = stdevf(x,fre,1)
) returns in each entry of the row
vector s
of type 1xsize(x,'c') the standard
deviation of each column of x
, each value counted
with the multiplicity indicated by the corresponding
value of fre
.
s = stdevf(x,fre,'c')
(or, equivalently,
s = stdevf(x,fre,2)
) returns in each entry of the
column vector s
of type size(x,'c')x1 the
standard deviation 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=stdevf(x,fre) m=stdevf(x,fre,'r') m=stdevf(x,fre,'c')
Bibliography
Wonacott, T.H. & Wonacott, R.J.; Introductory Statistics, fifth edition, J.Wiley & Sons, 1990.
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