xarray.Dataset.map¶
-
Dataset.
map
(self, func: Callable, keep_attrs: bool = None, args: Iterable[Any] = (), **kwargs: Any) → 'Dataset'¶ Apply a function to each variable in this dataset
- Parameters
func (callable) – Function which can be called in the form func(x, *args, **kwargs) to transform each DataArray x in this dataset into another DataArray.
keep_attrs (bool, optional) – If True, the dataset’s attributes (attrs) will be copied from the original object to the new one. If False, the new object will be returned without attributes.
args (tuple, optional) – Positional arguments passed on to func.
**kwargs (Any) – Keyword arguments passed on to func.
- Returns
applied – Resulting dataset from applying
func
to each data variable.- Return type
Examples
>>> da = xr.DataArray(np.random.randn(2, 3)) >>> ds = xr.Dataset({'foo': da, 'bar': ('x', [-1, 2])}) >>> ds <xarray.Dataset> Dimensions: (dim_0: 2, dim_1: 3, x: 2) Dimensions without coordinates: dim_0, dim_1, x Data variables: foo (dim_0, dim_1) float64 -0.3751 -1.951 -1.945 0.2948 0.711 -0.3948 bar (x) int64 -1 2 >>> ds.map(np.fabs) <xarray.Dataset> Dimensions: (dim_0: 2, dim_1: 3, x: 2) Dimensions without coordinates: dim_0, dim_1, x Data variables: foo (dim_0, dim_1) float64 0.3751 1.951 1.945 0.2948 0.711 0.3948 bar (x) float64 1.0 2.0