pastecs: reglin – R documentation

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reglin

Regulation of a series using a linear interpolation

Transform an irregular time series in a regular time series, or fill gaps in regular time series using a linear interpolation

reglin(x, y=NULL, xmin=min(x), n=length(x),
        deltat=(max(x) - min(x))/(n - 1), rule=1)

`x`	a vector with time in the irregular series. Missing values are allowed
`y`	a vector of same length as `x` and holding observations at corresponding times
`xmin`	allows to respecify the origin of time in the calculated regular time series. By default, the origin is not redefined and it is equivalent to the smallest value in `x`
`n`	the number of observations in the regular time series. By default, it is the same number than in the original irregular time series (i.e., `length(x)`
`deltat`	the time interval between two observations in the regulated time series
`rule`	the rule to use for extrapolated values (outside of the range in the initial irregular time series) in the regular time series. With `rule=1` (by default), these entries are not calculated and get `NA`; with `rule=2`, these entries are extrapolated

Observed values are connected by lines and interpolated values are obtained from this "polyline".

An object of type 'regul' is returned. It has methods print(), summary(), plot(), lines(), identify(), hist(), extract() and specs().

This function uses approx() for internal calculations

Frédéric Ibanez (ibanez@obs-vlfr.fr), Philippe Grosjean (phgrosjean@sciviews.org)

data(releve)
reg <- reglin(releve$Day, releve$Melosul)
plot(releve$Day, releve$Melosul, type="l")
lines(reg$x, reg$y, col=2)

Package for Analysis of Space-Time Ecological Series

v1.3.21

GPL-2

Authors

Philippe Grosjean [aut, cre], Frederic Ibanez [aut], Michele Etienne [ctb]

Initial release