# forge.ta.market_structure

```python
forge.ta.market_structure(open_: ArrayLike, high: ArrayLike, low: ArrayLike, close: ArrayLike, swing_len: int = 5, internal_len: int = 2, internal: bool = True, swing: bool = True, confluence_filter: bool = False, break_on: str = 'close') -> dict[str, np.ndarray]
```

Swings labelled HH, HL, LH and LL, with breaks of structure and changes of character.

A swing high is a bar whose high is above the high of every bar within ``swing_len`` bars on
each side; a swing low mirrors it. It is known ``swing_len`` bars later, and every value is
written on that later bar. A break is the first bar that closes (``break_on`` close) or
trades (``wick``) beyond the latest swing level; it is a change of character when the trend
was the other way and a break of structure otherwise. Internal structure uses ``internal_len``.
With ``confluence_filter`` an internal break is marked only when its bar closes in the break's
direction and the level it breaks is not the swing level. The parameter is spelled ``open_``
because ``open`` is a Python builtin.

Since Forge API 1.