rNFFT: Fast Fourier Transform at Nonequispaced Nodes

###   data.R
###   rNFFT : Data for the rNFFT package
###   Copyright (C) 2020  GZ Thompson <gzthompson@gmail.com>
###
###   This program is free software; you can redistribute it and/or modify
###   it under the terms of the GNU General Public License as published by
###   the Free Software Foundation; either version 3 of the License, or
###   (at your option) any later version.
###
###   This program is distributed in the hope that it will be useful,
###   but WITHOUT ANY WARRANTY; without even the implied warranty of
###   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
###   GNU General Public License for more details.
###
###     You should have received a copy of the GNU General Public License
###   along with this program; if not, a copy is available at
###   https://www.R-project.org/Licenses/

#' PET Phantom Example
#'
#' @format A \eqn{257 \times 257}{257 x 257} matrix representing a
#' PET phantom. From the output of the defunct PET package.
"phantom_example"