# Copyright (C) 2013-2016 Martin Drees
# Copyright (C) 2015-2018 Johannes Rueckert
#
# This file is part of darch.
#
# darch 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.
#
# darch 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 darch. If not, see <http://www.gnu.org/licenses/>.
# TODO replace with something simpler / more efficient
#' Makes start- and end-points for the batches.
#'
#' The start- and end-points are used for dividing the data into batches.
#'
#' @details If the data is not divisible by the \code{batchSize} the last batch
#' will contain the rest of the data.
#' The function returns a list with in which the first entry is a list with the
#' values for the start and end points for reading the data matrix. The second
#' entry is the number of batches.
#'
#' @param batchSize Desired batch size
#' @param numRows Number of rows of the data
#' @keywords internal
makeStartEndPoints <- function(batchSize,numRows)
{
numBatches <- ceiling(numRows / batchSize)
batchValues <- list()
batchValues[[1]] <- 0
for(n in 2:(numBatches))
{
batchValues[[n]] <- (n - 1) * batchSize
}
batchValues[[length(batchValues) + 1]] <- numRows
return(list(batchValues, numBatches))
}
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