R/MGC_Noise.R

In mhahsler/stream: Infrastructure for Data Stream Mining

#######################################################################
# Moving Generator -  Infrastructure for Moving Streams
# Copyright (C) 2013 Michael Hahsler, Matthew Bolanos, John Forrest
#
# 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 2 of the License, or
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

MGC_Noise_refClass <- setRefClass(
  "MGC_Noise",
  fields = list(
    density = "numeric",
    range = "matrix",
    dimension = "numeric"
  ),

  methods = list(
    initialize = function(d, r) {
      density  <<- d
      range <<- r
      dimension <<- nrow(r)
      .self
    }

  ),
)

MGC_Noise_refClass$methods(
  get_attributes = function(time, attributes = NULL) {
    att <- list(density = density, range = range)
    if (!is.null(attributes))
      att <- att[attributes]
    att
  },

  get_points = function(time) {
    apply(range, 1, function(x)
      runif(1, x[1], x[2]))
  }
)

#' @rdname MGC
#' @export
MGC_Noise <- function(density, range) {
  structure(
    list(
      description = "Noise",
      RObj = MGC_Noise_refClass$new(density, range)
    ),
    class = c("MGC_Noise", "MGC")
  )
}