# xarray.NamedArray.expand_dims

#### NamedArray.expand_dims(dim=Default.token)[[source]](https://github.com/pydata/xarray/blob/main/xarray/namedarray/core.py#L1269-L1308)

Expand the dimensions of the NamedArray.

This method adds new dimensions to the object. The new dimensions are added at the beginning of the array.

* **Parameters:**
  **dim** (`Hashable`, *optional*) – Dimension name to expand the array to. This dimension will be added at the beginning of the array.
* **Returns:**
  `NamedArray` – A new NamedArray with expanded dimensions.

### Examples

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```pycon
>>> data = np.asarray([[1.0, 2.0], [3.0, 4.0]])
>>> array = xr.NamedArray(("x", "y"), data)
```

# expand dimensions by specifying a new dimension name
>>> expanded = array.expand_dims(dim=”z”)
>>> expanded.dims
(‘z’, ‘x’, ‘y’)

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