code: public double getColunmSum(final int col) {
  		double sum = 0;
  		for (int i = 0; i < getRowCount(); i++) {
  			final double number = getValueAtAsDouble(i, col);
  			sum = JKNumbersUtil.addAmounts(sum, number);
  		}
  		return sum;
  	}
docs: /////////////////////////////////////////////////////////////////////////