ButterworthFilter: ButterworthFilter

In NCAR/Ranadu: Functions for use with RAF aircraft data files

ButterworthFilter

Description

Applies a low-pass Butterworth filter recursively

Usage

ButterworthFilter(x, tau = 200)

Arguments

x	A numeric vector giving the elements in the series
tau	A numeric that determines the time constant of the filter, in units of the steps in the input time series.

Details

See the description in"ProcessingAlgorithms.pdf". Do not use this function; it is for testing historical processing of RAF data files, but there is an error that causes an offset in the filtered values. Use signal::butter instead. Missing values are skipped in the recursive filter and are replicated in the output.

Value

The filtered numeric series

Author(s)

William Cooper

Examples

## Not run: xf <- ButterworthFilter (x, tau)

NCAR/Ranadu documentation built on Jan. 27, 2023, 1:09 a.m.