# xarray.IndexVariable.isnull

#### IndexVariable.isnull(keep_attrs=None)[[source]](https://github.com/pydata/xarray/blob/main/xarray/core/variable.py#L2582-L2614)

Test each value in the array for whether it is a missing value.

* **Returns:**
  **isnull** ([`Variable`](xarray.Variable.html.md#xarray.Variable)) – Same type and shape as object, but the dtype of the data is bool.

#### SEE ALSO
[`pandas.isnull`](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.isnull.html#pandas.isnull)

### Examples

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```pycon
>>> var = xr.Variable("x", [1, np.nan, 3])
>>> var
<xarray.Variable (x: 3)> Size: 24B
array([ 1., nan,  3.])
>>> var.isnull()
<xarray.Variable (x: 3)> Size: 3B
array([False,  True, False])
```

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