public NumericIndicator abs() {
        return NumericIndicator.of(UnaryOperation.abs(this));
    }
@Test
    public void abs() {
        final NumericIndicator numericIndicator = NumericIndicator.of(cp1);
        final NumericIndicator dynamicOp = numericIndicator.abs();
        assertNumEquals(1, dynamicOp.getValue(0));
        assertNumEquals(2, dynamicOp.getValue(series.getBarCount() - 1));
    }