magclass (version 3.74)

lowpass: 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)

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.

Value

The filtered data vector or MAgPIE object

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")