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else {
  var range = max - min
  for (i = offset; i < l; i+=dim) {
    if (!isNaN(arr[i])) {
      arr[i] = range === 0 ? .5 : (arr[i] - min) / range
    }
  }
}

else if (min == max) {
  for (i = offset; i < l; i+=dim) {
    if (!isNaN(arr[i])) {
      arr[i] = .5
    }
  }
}
else if (min == 0) {
  for (i = offset; i < l; i+=dim) {
    arr[i] = arr[i] / range
  }
}
else {
  for (i = offset; i < l; i+=dim) {
    arr[i] = (arr[i] - min) / range
  }
}