Xarray Example Cheatsheet

Xarray Example Cheatsheet.ipynb

Hello, thanks for sharing. can you indicate how to in stall fbd_core package? this command does not work : conda install fbd_core

Hello, thanks for sharing. can you indicate how to in stall fbd_core package? this command does not work : conda install fbd_core

fbd_core is an internal library, but here's the code for the expand_dimensions() function:

import numpy as np
import xarray as xr


def expand_dimensions(data, fill_value=np.nan, **new_coords):
    """
    Expand (or add if it doesn't yet exist) the data array to fill in new
    coordinates across multiple dimensions.

    If a dimension doesn't exist in the dataarray yet, then the result will be
    `data`, broadcasted across this dimension.

    >>> da = xr.DataArray([1, 2, 3], dims="a", coords=[[0, 1, 2]])
    >>> expand_dimensions(da, b=[1, 2, 3, 4, 5])
    <xarray.DataArray (a: 3, b: 5)>
    array([[ 1.,  1.,  1.,  1.,  1.],
           [ 2.,  2.,  2.,  2.,  2.],
           [ 3.,  3.,  3.,  3.,  3.]])
    Coordinates:
      * a        (a) int64 0 1 2
      * b        (b) int64 1 2 3 4 5

    Or, if `dim` is already a dimension in `data`, then any new coordinate
    values in `new_coords` that are not yet in `data[dim]` will be added,
    and the values corresponding to those new coordinates will be `fill_value`.

    >>> da = xr.DataArray([1, 2, 3], dims="a", coords=[[0, 1, 2]])
    >>> expand_dimensions(da, a=[1, 2, 3, 4, 5])
    <xarray.DataArray (a: 6)>
    array([ 1.,  2.,  3.,  0.,  0.,  0.])
    Coordinates:
      * a        (a) int64 0 1 2 3 4 5

    Args:
        data (xarray.DataArray):
            Data that needs dimensions expanded.
        fill_value (scalar, optional):
            If expanding new coords this is the value of the new datum.
            Defaults to `np.nan`.
        **new_coords (list[int | str]):
            The keywords are arbitrary dimensions and the values are
            coordinates of those dimensions that the data will include after it
            has been expanded.
    Returns:
        xarray.DataArray:
            Data that had its dimensions expanded to include the new
            coordinates.
    """
    ordered_coord_dict = OrderedDict(new_coords)
    shape_da = xr.DataArray(
        np.zeros(list(map(len, ordered_coord_dict.values()))),
        coords=ordered_coord_dict,
        dims=ordered_coord_dict.keys())
    expanded_data = xr.broadcast(data, shape_da)[0].fillna(fill_value)
    return expanded_data