// Sorting functions.

function sortLinkedArrays (input_array, linked_array) {
 var i, curlen = input_array.length
 var input_array_obj = new Array(curlen)
 for (i = 0; i < curlen; i++) {
  input_array_obj[i] = [input_array[i], linked_array[i]]
 }
 input_array_obj.sort (function (a, b) {
  if (a[0] > b[0]) {return 1} else {return 0}
 })
 for (i = 0; i < curlen; i++) {
  input_array[i]  = input_array_obj[i][0]
  linked_array[i] = input_array_obj[i][1]
 }
}

function getArrayIndices (input_array) {
 var i, curlen = input_array.length
 var input_array_obj = new Array(curlen)
 for (i = 0; i < curlen; i++) {
  input_array_obj[i] = [input_array[i], i]
 }
 input_array_obj.sort (function (a, b) {
  if (a[0] > b[0]) {return 1} else {return 0}
 })
 var output_array = new Array(curlen)
 for (i = 0; i < curlen; i++) {
  output_array[input_array_obj[i][1]] = i
 }
 return output_array
}