sinusoid: Create Sinusoids

Description

Create and display one or more sinusoids.

Usage

sinusoid (freqs, amps = rep(1, length(freqs)), dur = 50, 
phases = rep(0, length(freqs)), fs = 10000, sum = FALSE, 
show = FALSE, colors = NULL)

Value

A dataframe with the following columns:

time: The time, in milliseconds, at which is sample is taken.
waveN: A series of columns, each indicating the amplitude of wave N at a given time.
sum: A column indicating the sum of all of the sinusoids.

Arguments

freqs: A vector of frequencies, one for each desired sinusoid.
amps: A vector of peak amplitudes, one for each desired sinusoid.
dur: The desired duration of the sinusoids, in milliseconds.
phases: A vector of initial phases, one for each desired sinusoid, expressed in radians.
fs: The desired sampling frequency of the sinusoids.
sum: If TRUE, the sum the generated sinusoids is also found.
show: If TRUE, the generated sinusoids are plotted. If sum is TRUE, a second plot is created to display the sum of the sinusoids.
colors: An optional vector of colors used to plot the individual sinusoids. If the number of colors given is less than the number of frequencies specified, the colors are repeated.

Author

Santiago Barreda <sbarreda@ucdavis.edu>

Details

A number of sinusoids are generated, and optionally plotted and/or returned. The number of frequencies specified must equal the number of amplitudes and initial phases.

Examples

Run this code

## several waves, and the sum
#sum = sinusoid (freqs = c(100,200,300), amps = c(1,3,2), 
#sum = TRUE, show = TRUE)

## no sum, different phase shifts
#nosum = sinusoid (freqs = c(100,200,300), amps = c(1,3,2), 
#phases = c(pi/2, 0, pi/4), sum = FALSE)

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