# forge.ta.sar

```python
forge.ta.sar(high: ArrayLike, low: ArrayLike, af_step: float = 0.02, af_max: float = 0.2) -> np.ndarray
```

Parabolic stop and reverse.

``SAR[i+1] = SAR[i] + AF * (EP - SAR[i])``: ``EP`` is the extreme price of the current trend and
``AF`` starts at ``af_step``, grows by ``af_step`` with each new extreme and stops at
``af_max``. A reversal restarts both. The value is withheld until the first reversal the price
itself causes, so a guessed starting direction never reaches the chart. NaN for a run of fewer
than 3 bars.

Since Forge API 1.

## Class forge.ta.SAR

```python
forge.ta.SAR(**inputs: Any) -> None
```

Trailing stop-and-reverse level that speeds up as the trend runs.

SAR[i+1] = SAR[i] + AF * (EP - SAR[i]), EP = the extreme price of the trend

AF starts at the step, grows by the step with each new extreme and stops at the maximum.

A reversal restarts EP and AF. The first leg is seeded short and is left empty until the first reversal the price itself causes.

Since Forge API 1.