# forge.ta.change

```python
forge.ta.change(source: ArrayLike, period: int = 1) -> np.ndarray
```

Value now minus the value ``period`` bars ago.

Since Forge API 1.

## Class forge.ta.Change

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

Value now minus the value a number of bars ago.

change = x[i] - x[i-period]

Since Forge API 1.