rollmean_ {cycleRtools}

Rolling average smoothing.

Description

Smooth data with a right-aligned (zero-padded) rolling average.

Usage

rollmean_(x, window, ema, narm)

rollmean_smth(data, column, smth.pd, deltat = NULL, ema = FALSE,
  character.only = FALSE)

Arguments

x

numeric; values to be rolled over.

window

numeric; size of the rolling window in terms of elements in x.

ema

logical; should the moving average be exponentially weighted?

narm

logical; should NAs be removed?

data

a dataset of class cycleRdata.

column

the column name of the data to be smoothed, needn't be quoted.

smth.pd

numeric; the time period over which to smooth (seconds).

deltat

the sampling frequency of data in seconds per sample; typically 0.5 or 1. If NULL, this is estimated.

character.only

are column name arguments given as character strings? A backdoor around non-standard evaluation.

Details

rollmean_ is the core Rcpp function, which rolls over elements in x by a window given in window; optionally applying exponential weights and/or removing NAs. rollmean_smth is a wrapper for rollmean_ that only has a method for cycleRdata objects. The latter will pre-process the data and permits what is effectively the window argument being given in time units.

Value

a vector of the same length as the data[, column].

Examples

## Not run: 
data(ridedata)

## Smooth power data with a 30 second moving average.
rollmean_smth(ridedata, power.W, 30)

## Or use an exponentially weighted moving average.
rollmean_smth(ridedata, power.W, 30, ema = TRUE)

## End(Not run)