wcenter
center and weight
Syntax
s = wcenter(x) s = wcenter(x, orientation)
Arguments
x: real or complex vector or matrix
- orientation
index of the dimension along which the wcenter 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 s
, the weighted and centred
version of the numerical matrix x
.
For a vector or a matrix x
, s = wcenter(x)
or
s = wcenter(x, "*")
returns in the (i,j)
coefficient of the matrix
s
the value (x(i,j)-xbar)/sigma
, where
xbar
is the mean of the values of the coefficients of
x
and sigma
his standard deviation.
s = wcenter(x, 'r')
(or, equivalently,
s = wcenter(x, 1)
) is the rowwise centre reduction of
the values of x
. It returns in the entry s(i,j)
the value (x(i,j)-xbarv(j))/sigmav(j)
with
xbarv(j)
the mean of the values of the j
column and sigmav(j)
the standard deviation of the
j
column of x
.
s = wcenter(x, 'c')
(or, equivalently,
s = wcenter(x, 2)
) is the columnwise centre reduction of
the values of x
. It returns in the entry
s(i,j)
the value (x(i,j)-xbarh(i))/sigmah(i)
with
xbarh(i)
the mean of the values of the i
row
and sigmah(i)
the standard deviation of the i
row of x
.
Examples
x=[0.2113249 0.0002211 0.6653811; 0.7560439 0.3303271 0.6283918] s = wcenter(x) s = wcenter(x,'r') s = wcenter(x,'c')
See also
- center — center
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