regconst {pastecs} | R Documentation

## Regulate a series using the constant value method

### Description

Transform an irregular time series in a regular time series, or fill gaps in regular time series using the constant value method

### Usage

    regconst(x, y=NULL, xmin=min(x), n=length(x),
            deltat=(max(x) - min(x))/(n - 1), rule=1, f=0)

### Arguments

`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
`f` | coefficient giving more weight to the left value (`f=0`, by default), to the right value (`f=`) or to a combination of these two observations (0 < f <1)

### Details

This is the simplest, but the less powerful regulation method. Interpolated values are calculated according to existing observations at left and at right as: x[reg] = x[right]*f + x[left]*(f-1), with 0 < f < 1.

### Value

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

### Note

This function uses `approx()` for internal calculations

### Author(s)

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

### See Also

`regul`, `regarea`, `reglin`, `regspline`, `regul.screen`, `regul.adj`, `tseries`, `is.tseries`, `approxfun`

### Examples

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

[Package pastecs version 1.3-4 Index]