R/shared-functions.R

In granovaGG: Graphical Analysis of Variance Using ggplot2

GetListElementByIndex <- function(x, index) {
  return(x[[index]])
}

Theme <- function(plot.theme) {
    return(
      eval(call(plot.theme))
    )
}

GetContrastName <- function(contrast.data, index) {
  if (is.null(dimnames(contrast.data))) {
    contrast.name <- paste(index)
  }
  else {
    provided.contrast.name <- dimnames(contrast.data)[[2]][index]
    contrast.name <- paste(provided.contrast.name)
  }
  
  return(paste("Contrast ", contrast.name, sep=""))
}

# ReorderDataByColumn reorders a data structure according to the values in "column"
# For example, "sort the data on all these cars according to their highway mileage"
ReorderDataByColumn <- function(x, column) { 
  return(x[order(x[[column]]), ])
}

OverlapWarning <- function(data, tolerance) {
  first <- FirstElementOverlaps(data, tolerance)
  inner <- InnerElementsOverlap(data, tolerance)
  last  <- LastElementOverlaps(data, tolerance)
  
  return(c(first, inner, last))
}

FirstElementOverlaps <- function(data, tolerance) {
  return(
    abs(data[1] - data[2]) < tolerance
  )
}

InnerElementsOverlap <- function(data, tolerance) {
  return(sapply(
           X         = 2:(length(data) - 1),
           FUN       = NeighborOverlaps,
           data      = data,
           tolerance = tolerance
         )
  )
}

LastElementOverlaps <- function(data, tolerance) {
  last.index <- length(data)
  return(
    abs(data[last.index] - data[(last.index) - 1]) < tolerance
  )
}

NeighborOverlaps <- function(data, tolerance, index) {
  left.overlap  <- abs(data[index] - data[(index - 1)]) < tolerance
  right.overlap <- abs(data[index] - data[(index + 1)]) < tolerance
  
  return(left.overlap | right.overlap)
}