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Overview

The swdft package implements the Sliding Window Discrete Fourier Transform (SWDFT), and provides some statistical methods and graphical tools based on the SWDFT.

Installation

# The swdft package is available on CRAN
install.packages("swdft")
# The development version is available on Github
# install.packages("devtools")
devtools::install_github("leerichardson/swdft/r/swdft")

See the vignette for an introduction.

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Version

Install

install.packages('swdft')

Monthly Downloads

129

Version

1.0.0

License

MIT + file LICENSE

Maintainer

Lee F. Richardson

Last Published

April 17th, 2019

Functions in swdft (1.0.0)

Demodulate a Fourier Frequency with the SWDFT

Local cosine regression

Sine signal with adjustable parameters

Dirichlet Kernel (Weight) for arbitrary summation indices

Smooth SWDFT coefficients with a convolution

Cosine regression

Covariance between two complex-numbered outputs

Extract amplitude and phase

Cosine signal with adjustable parameters

Get range of frequencies to search

Simple high pass filter

Constructor function for class 'swdft'

The principal nth root of unity

residuals.swdft_mod

Residuals method for swdft_cosreg objects

Compute the log likelihood

Get the maximum DFT coefficient

new_swdft_local_cosreg

Constructor function for class 'swdft_local_cosreg'

Local Periodic Signal

dirichlet_kernel

Dirichlet Kernel

fitted.swdft_mod

Fitted values method for swdft_cosreg objects

Cosine bell data taper

Matching Demodulation

new_swdft_matching_demod

Constructor function for class 'swdft_matching_demod'

Plot method for 'swdft' object

Extract signal parameters

new_swdft_cosreg

Constructor function for class swdft_mod

Create taper for the SWDFT

Smooth the SWDFT coefficients

Get range of P's to search

Sliding Window Discrete Fourier Transform

new_swdft_demod

Constructor function for class 'swdft_demod'

Extract estimator of sigma

Sliding Window Discrete Fourier Transform using fftw

Convert the SWDFT to proportions of frequency

3D Sliding Window Discrete Fourier Transform

Plot method for swdft_mod object

2D Sliding Window Discrete Fourier Transform using fftw

Constructor function for class 'swdft2d'

2D Sliding Window Discrete Fourier Transform

2D Sliding Window Discrete Fourier Transform using base R

Constructor function for class 'swdft3d'

3D SWDFT using base R

Sliding Window Discrete Fourier Transform with base R

Phase unwrapping

coefficients.swdft_mod

Coefficients method for swdft_cosreg objects

Complex Demodulation