oce (version 0.1-76)

decimate: Decimate an oce object

Description

Decimate, or subsample, an oce object.

Usage

decimate(x, by=10, method=c("direct", "filter"), filter)

Arguments

x

an oce object containing a data element.

by

an indication of the subsampling. The first element is selected, then the 1+by element, etc.

method

only one is provided at the moment: direct, which indicates straight decimate, or subsampling.

filter

a list of numbers representing a digital filter to be applied to each variable in x$data before decimation is done. This must be supplied if method="filter".

Value

• An object of class "oce" that has been subsampled appropriately.

Details

Later on, other methods will be added, and ctd.decimate will be retired in favour of this, a more general, function.

The filtering is done with the filter function of the stats package. This produces NA values near the start and end of the series, and since this is bothersome in some applications, decimate substitutes the original values in those spots.

See Also

ctd.decimate, which will be retired when the present function gains equivalent functionality.

Examples

library(oce)
data(ctd)
d <- decimate(ctd, by=5)
plot(d)