R/numericData.R

In USGS-R/smwrGraphs: Graphing Functions

#' Numeric Values
#' 
#' Converts data to numeric values (support function).
#' 
#' 
#' @param x any vector that can be converted to numeric.
#' @param lev levels for character data that represent categories rather than
#' character representations of numeric values.
#' @return Numeric data represented by \code{x}.
#' @keywords dplot
#' @export numericData
numericData <- function(x, lev=NULL) {
	# Coding History:
	#    2011Jan08 DLLorenz Original coding.
	#    2012Oct26 DLLorenz Fix to adjust POSIXt dates to local time
	#    2014Jun26 DLLorenz Converted to roxygen
	#
  if(isDateLike(x)) {
    x.Date <- as.Date(x)
    x.temp <- as.POSIXlt(x)
    attr(x.temp, "tzone") <- "GMT"
    x.temp <- as.double(x.temp) - as.double(as.POSIXlt(x.Date))
    x.temp <- x.temp / 86400
    return(as.double(x.Date + x.temp))
  }
  if(isCharLike(x)) {
    if(is.factor(x)) {
      if(is.null(lev)) {
        lev <- levels(x)
        ##        print(lev)
      }
      x <- as.character(x)
    }
    else { # Must be character
      if(is.null(lev))
        return(as.double(x)) # if levels is null, treat as numeric
    }
    return(as.double(factor(x, levels=lev)))
  }
  ## Anything else?
  return(as.double(x))
}