# tree_d_3d.kernels.quadtree_moments.quadtree_moments_metal

*module*

The Metal version (Apple-silicon GPU, float32) of the ``quadtree_moments`` kernel.

``quadtree_moments_pyccel.py`` next to this file is the CPU version with the same
arguments. One thread per node, each summing its own particles; only the first
``node_count`` rows of the outputs are written. See :mod:`tree_d_3d.kernels._metal`.

[View source](https://github.com/max-models/tree-d-3d/blob/devel/src/tree_d_3d/kernels/quadtree_moments/quadtree_moments_metal.py#L1-L1)

## tree_d_3d.kernels.quadtree_moments.quadtree_moments_metal.quadtree_moments

*function*

```python
def quadtree_moments(pos: Array, charge: Array, perm: Array, node_count: int, node_center: Array, node_start: Array, node_end: Array, node_q: Array, node_qabs: Array, node_p: Array, node_s: Array) -> None
```

Signed moments of every node about its centre; ``node_s`` is xx, xy, yy.

[View source](https://github.com/max-models/tree-d-3d/blob/devel/src/tree_d_3d/kernels/quadtree_moments/quadtree_moments_metal.py#L48-L72)