R/ChromosomalModel.getPositionChipTypeUnit.R

In aroma.affymetrix: Analysis of Large Affymetrix Microarray Data Sets

setMethodS3("getPositionChipTypeUnit", "ChromosomalModel", function(this, chromosome, force=FALSE, ..., verbose=FALSE) {
  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  # Validate arguments
  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  # Argument 'force':
  force <- Arguments$getLogical(force)

  # Argument 'chromosome':
  chromosome <- Arguments$getIndex(chromosome)
  knownChromosomes <- getChromosomes(this)
  if (!chromosome %in% knownChromosomes) {
    throw("Argument 'chromosome' contains an unknown chromosome: ", chromosome)
  }

  # Argument 'verbose':
  verbose <- Arguments$getVerbose(verbose)
  if (verbose) {
    pushState(verbose)
    on.exit(popState(verbose))
  }



  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  # Get (position, chipType, unit) map for this chromosome
  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  verbose && enter(verbose, "Getting (position, chipType, unit) map")

  # Get the UnitNameFile:s
  unfList <- getListOfUnitNamesFiles(this, verbose=less(verbose, 10))

  # Get the genome information files
  ugpList <- lapply(unfList, FUN=getAromaUgpFile, verbose=less(verbose, 10))
  verbose && print(verbose, ugpList)

  # Get the genome information files
  ugpList <- lapply(unfList, FUN=getAromaUgpFile, verbose=less(verbose, 10))
  verbose && print(verbose, ugpList)

  # Get the units on the chromosome of interest
  unitsList <- lapply(ugpList, FUN=function(ugp) {
    getUnitsOnChromosome(ugp, chromosome=chromosome, ...)
  })
  verbose && str(verbose, unitsList)

  # Gets (position, chipType) for these units
  posList <- vector("list", length(unitsList))
  names(posList) <- names(unitsList)
  chipTypeList <- vector("list", length(unitsList))
  names(chipTypeList) <- names(unitsList)
  for (kk in seq_along(posList)) {
    ugp <- ugpList[[kk]]
    units <- unitsList[[kk]]
    pos <- getPositions(ugp, units=units)

    # Keep only units with a position
    keep <- which(is.finite(pos))
    nbrOfUnitsBefore <- length(pos)
    nbrOfUnits <- length(keep)
    nbrOfUnitsExcl <- nbrOfUnitsBefore - nbrOfUnits
    if (nbrOfUnitsExcl > 0) {
      pos <- pos[keep]
      units <- units[keep]
      verbose && cat(verbose, "Excluded ", nbrOfUnitsExcl, " (out of", nbrOfUnitsBefore, ") units because there is no position information available for those.")
    }
    unitsList[[kk]] <- units
    posList[[kk]] <- pos
    chipTypeList[[kk]] <- rep(kk, length(units))
    # Not needed anymore
    ugp <- units <- keep <- NULL
  }
  # Not needed anymore
  ugpList <- NULL

  verbose && str(verbose, unitsList)
  verbose && str(verbose, posList)
  verbose && str(verbose, chipTypeList)

  # Unlist and order (units, position, chipType) by position
  pos <- unlist(posList, use.names=FALSE)
  # Not needed anymore
  posList <- NULL
  o <- order(pos)
  pos <- pos[o]

  chipType <- unlist(chipTypeList, use.names=FALSE)
  # Not needed anymore
  chipTypeList <- NULL
  chipType <- chipType[o]

  # Convert chipType into a factor
  chipTypes <- sapply(unfList, FUN=getChipType)
  attr(chipType, "levels") <- chipTypes
  class(chipType) <- "factor"
  # Not needed anymore
  unfList <- NULL

  units <- unlist(unitsList, use.names=FALSE)
  # Not needed anymore
  unitsList <- NULL
  units <- units[o]
  # Not needed anymore
  o <- NULL

  pcu <- data.frame(position=pos, chipType=chipType, unit=units)
  # Not needed anymore
  units <- pos <- chipType <- NULL

  # Garbage collect
  gc <- gc()
  verbose && print(verbose, gc)

  verbose && cat(verbose, "(position, chipType, unit) map:")
  verbose && str(verbose, pcu)

  verbose && exit(verbose)

  pcu
}, protected=TRUE)