src/library/base/R/tabulate.R

#  File src/library/base/R/tabulate.R
#  Part of the R package, https://www.R-project.org
#
#  Copyright (C) 1995-2017 The R Core Team
#
#  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
#  (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.
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#  A copy of the GNU General Public License is available at
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tabulate <- function(bin, nbins = max(1L, bin, na.rm = TRUE))
{
    if(!is.numeric(bin) && !is.factor(bin))
	stop("'bin' must be numeric or a factor")
    ## avoid a copy for factors, since as.integer strips attributes
    if (typeof(bin) != "integer") bin <- as.integer(bin)
    if (nbins > .Machine$integer.max)
        stop("attempt to make a table with >= 2^31 elements")
    nbins <- as.integer(nbins)
    if (is.na(nbins)) stop(gettextf("invalid value of %s", "'nbins'"), domain=NA)
    .Internal(tabulate(bin, nbins))
}