private HyperBoundingBox mbr(final int[] entries, final int from, final int to) {
    SpatialEntry first = this.node.getEntry(entries[from]);
    ModifiableHyperBoundingBox mbr = new ModifiableHyperBoundingBox(first);
    for(int i = from + 1; i < to; i++) {
      mbr.extend(this.node.getEntry(entries[i]));
    }
    return mbr;
  }
private HyperBoundingBox mbr ( final int [ ] entries , final int from , final int to ) { SpatialEntry first = this . node . getEntry ( entries [ from ] ) ; ModifiableHyperBoundingBox mbr = new ModifiableHyperBoundingBox ( first ) ; for ( int i = from + 1 ; i < to ; i ++ ) { mbr . extend ( this . node . getEntry ( entries [ i ] ) ) ; } return mbr ; }
Computes and returns the mbr of the specified nodes, only the nodes between
from and to index are considered.

@param entries the array of node indices
@param from the start index
@param to the end index
@return the mbr of the specified nodes