Scales a 'timeSeries' object.

`scale`

is a function to center and/or scale the columns of a
'timeSeries' object.

The value of `center`

determines how column centering is performed.
If `center`

is a numeric vector with length equal to the number
of columns of `x`

, then each column of `x`

has the corresponding
value from `center`

subtracted from it. If `center`

is TRUE
then centering is done by subtracting the column means (omitting NAs)
of `x`

from their corresponding columns, and if `center`

is FALSE, no centering is done.

The value of `scale`

determines how column scaling is performed
(after centering). If `scale`

is a numeric vector with length equal
to the number of columns of `x`

, then each column of `x`

is
divided by the corresponding value from `scale`

. If `scale`

is TRUE then scaling is done by dividing the (centered) columns of
`x`

by their standard deviations if `center`

is TRUE, and
the root mean square otherwise. If `scale`

is FALSE, no
scaling is done.

Returns a centered and/or scaled 'timeSeries' object.

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