lowpass: Lowpass Filter

In magclass: Data Class and Tools for Handling Spatial-Temporal Data

Lowpass Filter

Description

Filters high frequencies out of a time series. The filter has the structure x'(n) = (x(n-1)+2*x(n)+x(n+1))/4

Usage

lowpass(x, i = 1, fix = NULL, altFilter = NULL, warn = TRUE)

Arguments

x	Vector of data points, that should be filtered or MAgPIE object
i	number of iterations the filter should be applied to the data
fix	Fixes the starting and/or ending data point. Default value is NULL which doesn't fix any point. Available options are: "start" for fixing the starting point, "end" for fixing the ending point and "both" for fixing both ends of the data.
altFilter	set special filter rule to indexes defined in this parameter. The special filter has the structure x'(n) = (2*x(n)+x(n+1))/3
warn	boolean deciding whether lowpass issues a warning for critical parameter choices or not

Value

The filtered data vector or MAgPIE object

Author(s)

Jan Philipp Dietrich, Misko Stevanovic

Examples

lowpass(c(1, 2, 11, 3, 4))
# to fix the starting point
lowpass(c(0, 9, 1, 5, 14, 20, 6, 11, 0), i = 2, fix = "start")

magclass documentation built on July 9, 2023, 7:03 p.m.