code: function calculateColumnAverage(inputMatrix)
  {
  	var rows = inputMatrix.rows();
  	
  	var averages = new Array();
  	for(var i = 1; i <= inputMatrix.cols(); i++)
  	{
  		var sum = 0;
  		for(var j = 1; j <= inputMatrix.rows(); j++)
  		{
  			sum += inputMatrix.e(j, i);
  		}
  		averages[i-1] = sum/rows;
  	}
  	
  	return $V(averages);
  }
docs: Computes the average value for each column of a matrix of values.
  @param input A matrix of the input values
  @returns Vector Average value for each column. Vector[i] is the average for column i.