amp.freq: Computes amplitude and frequency of wave-like data

In ckenaley/trackter: Automated Kinematic Analysis of Image Data

Description

Computes amplitude(s) and frequencies(s) of a wave form, amongst other things, based on a sampling frequency

Usage

amp.freq(x = NULL, y, sf = 100)

Arguments

x	Numeric; x position (or sample number)
y	numeric; y position
sf	numeric; sample frequency (i.e., how often was x and y sampled) in Hz

Details

computes amplitudes as half the distance between each successive pair of critical points (i.e., points where the derivative is zero).

Value

a list with of the following:

• a: a numeric vector of amplitudes ('a').

• pos: a numeric vector of the position of critical points.

• f: a numeric vector of the peak-to-peak frequencies (if the first critical point is a peak) or trough-to-trough frequencies (if the first critical point is a trough).

• snr:a numeric value of the signal to noise ratio.

See Also

features

Examples

#Compute waveform patterns
x <- seq(0,pi,0.1)
y <- sin(x^1.3*pi)
plot(x,y)

amp.freq(x=x,y=y)

ckenaley/trackter documentation built on Feb. 11, 2022, 6:43 a.m.