id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
143551401,MDU6SXNzdWUxNDM1NTE0MDE=,804,Compute multiple dask backed arrays at once,2783717,closed,0,,,5,2016-03-25T17:48:03Z,2018-03-07T01:40:49Z,2018-03-07T01:40:42Z,NONE,,,,"In dask, a user can compute multiple arrays in a single scheduler run using the `dask.compute` function:

``` python
>>> a_computed, b_computed = dask.compute(a, b)
```

This is nice for when `a` and `b` might share intermediates. The same can be done currently in xarray if `a` and `b` are first put into a dataset:

``` python
>>> both = xr.Dataset(dict(a=a, b=b))
>>> both.load()    # Compute all the arrays in a single pass
```

This is fine, but it might also be nice to be able to do this without first putting everything into a dataset. I'm not sure what a good api is here, as xarray objects mutate when computed. Perhaps just adding an `xr.compute(*args)` function that fully realizes all dask backed variables.

``` python
>>> xr.compute(a, b)    # a and b now contain numpy arrays, not dask arrays
```
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132818023,MDU6SXNzdWUxMzI4MTgwMjM=,758,No check for dimension compatibility on DataArray creation,2783717,closed,0,,,1,2016-02-10T21:08:32Z,2016-02-15T02:21:33Z,2016-02-15T02:21:33Z,NONE,,,,"When creating a DataArray with an iterable of coordinates, no check is made that the dimensions of the coordinates match the shape of the data. Unsure if there's a reason why this isn't checked in xarray or not (I'd expect it to be). This may also just me using xarray wrong. I got bit by this earlier with a typo in my code:

``` python
In [1]: import xarray as xr

In [2]: import numpy as np

In [3]: a = np.arange(6).reshape((2, 3))

In [4]: x = np.arange(3)

In [5]: y = np.arange(2, 4)

In [6]: xa = xr.DataArray(a, coords=[x, x], dims=['x', 'y'])   # Oop, gave x twice, instead of [x, y]

In [7]: xa.shape
Out[7]: (2, 3)

In [8]: xa.coords
Out[8]:
Coordinates:
  * x        (x) int64 0 1 2
  * y        (y) int64 0 1 2
```
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