simchirp: Compute and return simulated chirp function.

In wavethresh: Wavelets Statistics and Transforms

Compute and return simulated chirp function.

Description

This function computes and returns the coordinates of the reflected simulated chirp function described in Nason and Silverman, 1995. This function is a useful test function for evaluating wavelet shrinkage and time-scale analysis methodology as its frequency changes over time.

Usage

simchirp(n=1024)

Arguments

n	The number of ordinates from which to sample the chirp signal.

Details

This function computes and returns the x and y coordinates of the reflected chirp function described in Nason and Silverman, 1995.

The formula for the reflected simulated chirp is *formula*

The chirp returned is a discrete sample on n equally spaced points between -1 and 1.

Value

A list with two components:

x	a vector of length n containing the ordered x ordinates of the chirp from -1 to 1.
y	a vector of length n containing the corresponding y ordinates of the chirp.

RELEASE

Version 3.5.3 Copyright Guy Nason 1994

Author(s)

G P Nason

Examples

#
# Generate the chirp
#
test.data <- simchirp()$y
## Not run: ts.plot(test.data)

wavethresh documentation built on Sept. 11, 2024, 9:33 p.m.