public function getSamplingNodes()
	{
		$nodes	= array();
		$start	= $this->interval->getStart();
		$distance	= $this->getNodeDistance();
		for( $i = 0; $i<$this->getNodes(); $i++ )
		{
			$x = $start + $i * $distance;
			$nodes[] = $x;
		}
		return $nodes;
	}