# forge.ta.sum

```python
forge.ta.sum(source: ArrayLike, period: int = 30) -> np.ndarray
```

The sum of the last ``period`` values. A window that holds a missing value has no value.

Since Forge API 1.

## Class forge.ta.Sum

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

The sum of the last values over a number of bars.

The sum of the last period values. A window holding a missing value has no value.

Since Forge API 1.