R/cutSemicolon.R

In kliegr/arc: Association Rule Classification

#  Copyright (C) 1995-2014 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
#  https://www.R-project.org/Licenses/

# cut function from R.base with one modification:
# numbers are separated with semicolon instead of comma
cutSemicolon <-
  function (x, breaks, labels = NULL, include.lowest = FALSE,
            right = TRUE, dig.lab = 3L, ordered_result = FALSE, ...)
  {
    numsep<-";"
    if (!is.numeric(x)) stop("'x' must be numeric")
    if (length(breaks) == 1L) {
      if (is.na(breaks) || breaks < 2L)
        stop("invalid number of intervals")
      nb <- as.integer(breaks + 1) # one more than #{intervals}
      dx <- diff(rx <- range(x, na.rm = TRUE))
      if(dx == 0) {
        dx <- abs(rx[1L])
        breaks <- seq.int(rx[1L] - dx/1000, rx[2L] + dx/1000,
                          length.out = nb)
      } else {
        breaks <- seq.int(rx[1L], rx[2L], length.out = nb)
        breaks[c(1L, nb)] <- c(rx[1L] - dx/1000, rx[2L] + dx/1000)
      }
    } else nb <- length(breaks <- sort.int(as.double(breaks)))
    if (anyDuplicated(breaks)) stop("'breaks' are not unique")
    codes.only <- FALSE
    if (is.null(labels)) {#- try to construct nice ones ..
      for(dig in dig.lab:max(12L, dig.lab)) {
        ## 0+ avoids printing signed zeros as "-0"
        ch.br <- formatC(0+breaks, digits = dig, width = 1L)
        if(ok <- all(ch.br[-1L] != ch.br[-nb])) break
      }
      labels <-
        if(ok) paste0(if(right)"(" else "[",
                      ch.br[-nb], numsep, ch.br[-1L],
                      if(right)"]" else ")")
      else paste("Range", seq_len(nb - 1L), sep="_")
      if (ok && include.lowest) {
        if (right)
          substr(labels[1L], 1L, 1L) <- "[" # was "("
        else
          substring(labels[nb-1L],
                    nchar(labels[nb-1L], "c")) <- "]" # was ")"
      }
    } else if (is.logical(labels) && !labels)
      codes.only <- TRUE
    else if (length(labels) != nb - 1L)
      stop("lengths of 'breaks' and 'labels' differ")
    code <- .bincode(x, breaks, right, include.lowest)
    if(codes.only) code
    else factor(code, seq_along(labels), labels, ordered = ordered_result)
  }