##
## Copyright (c) 2010, 2011, Brandon Whitcher
## All rights reserved.
##
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## modification, are permitted provided that the following conditions are
## met:
##
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above
## copyright notice, this list of conditions and the following
## disclaimer in the documentation and/or other materials provided
## with the distribution.
## * Neither the name of Rigorous Analytics Ltd. nor the names of
## its contributors may be used to endorse or promote products
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##
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## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
## $Id: $
##
#' Convert Decimal to Base N Number in String
#'
#' This function converts the nonnegative integer to the specified base.
#'
#' This function converts the nonnegative integer \code{n} to the specified
#' base, where \code{n} must be a nonnegative integer smaller than \eqn{2^52},
#' \code{base} must be an integer between 2 and 36 and \code{len} suggests the
#' length of the character string.
#'
#' @aliases dec2base dec2hex
#' @param n Non-negative integer.
#' @param base Number between 2 and 36.
#' @param len Length of the character string.
#' @return The returned argument is a string.
#' @author Brandon Whitcher \email{bwhitcher@@gmail.com}
#' @keywords misc
#' @examples
#'
#' x <- dec2base(23, 2)
#'
#' @export
dec2base <- function(n, base, len=0) {
symbols <- c(as.character(0:9), LETTERS)
max.len <- max(trunc(log(max(n, 1)) / log(base)) + 1, len)
## determine digits for each number
power <- rep(1, length(n)) * base^((max.len-1):0)
n <- n * rep(1, max.len)
digits <- floor((n %% (base * power)) / power)
## convert digits to symbols
paste(symbols[digits + 1], collapse="")
}
#' @rdname dec2base
#' @export
dec2hex <- function(n, len=0) {
dec2base(n, 16, len)
}
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