# forge.ta.crossover

```python
forge.ta.crossover(a: ArrayLike | float, b: ArrayLike | float) -> np.ndarray
```

True on the bar where ``a`` goes from at or below ``b`` to above it.

``a[i] > b[i]`` and ``a[i-1] <= b[i-1]``, with all four values present; the first bar is
false. A touch followed by a move away counts as a cross. Either side may be a plain number,
such as a level, but not both. The result is a true or false array, which a strategy's entry
field takes as it is. Example: ``ta.crossover(fast, slow)``.

Since Forge API 1.