Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1220#issuecomment-146474169
A more scalaesque solution for the `partitionBox` method without using vars
and for loops would be
```
def partitionBox(center: Vector, width: Vector): Seq[Vector] = {
def partitionHelper(box: Seq[Vector], dim: Int): Seq[Vector] = {
if (dim >= width.size) {
box
} else {
val newBox = box.flatMap {
vector =>
val (up, down) = (vector.copy, vector)
up.update(dim, up(dim) - width(dim) / 4)
down.update(dim, down(dim) + width(dim) / 4)
Seq(up, down)
}
partitionHelper(newBox, dim + 1)
}
}
partitionHelper(Seq(center), 0)
}
```
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