public LazyAreaEval getColumn(int columnIndex) {if (columnIndex >= getWidth()) {throw new IllegalArgumentException("Invalid columnIndex " + columnIndex+ ".  Allowable range is (0.." + getWidth() + ").");}int absColIx = getFirstColumn() + columnIndex;return new LazyAreaEval(getFirstRow(), absColIx, getLastRow(), absColIx, _evaluator);}

public override TwoDEval GetColumn(int columnIndex){if (columnIndex >= Width){throw new ArgumentException("Invalid columnIndex " + columnIndex+ ".  Allowable range is (0.." + Width + ").");}int absColIx = FirstColumn + columnIndex;return new LazyAreaEval(FirstRow, absColIx, LastRow, absColIx, _evaluator);}
