#  File src/library/base/R/zapsmall.R
#  Part of the R package, http://www.R-project.org
#
#  Copyright (C) 1995-2012 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.
#
#  A copy of the GNU General Public License is available at
#  http://www.r-project.org/Licenses/

zapsmall <- function(x, digits = getOption("digits"))
{
    if (length(digits) == 0L)
        stop("invalid 'digits'")
    if (all(ina <- is.na(x)))
        return(x)
    mx <- max(abs(x[!ina]))
    round(x, digits = if(mx > 0) max(0L, digits - log10(mx)) else digits)
}