ravetools (version 0.2.2)

decimate: Decimate with 'FIR' or 'IIR' filter

Description

Decimate with 'FIR' or 'IIR' filter

Usage

decimate(x, q, n = if (ftype == "iir") 8 else 30, ftype = "fir")

Value

Decimated signal

Arguments

x

signal to be decimated

q

integer factor to down-sample by

n

filter order used in the down-sampling; default is 30 if ftype='fir', or 8 if ftype='iir'

ftype

filter type, choices are 'fir' (default) and 'iir'

Details

This function is migrated from gsignal package, but with padding and indexing fixed. The results agree with 'Matlab'.

Examples

x <- 1:100
y <- decimate(x, 2, ftype = "fir")
y

# compare with signal package
z <- gsignal::decimate(x, 2, ftype = "fir")

# Compare decimated results
plot(x, type = 'l')
points(seq(1,100, 2), y, col = "green")
points(seq(1,100, 2), z, col = "red")