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