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I guess the main reason barrier for me is initializing the coordinates quickly, which xr.DataArray(np.ones(3, 4), dims=['x', 'y']) doesn't do.

What would use suggest for the signature of a function like xr.ones?

Something like the following would work for me:

```python def ones(shape, dims=None): """Create DataArray of ones with initialized coordinates

Parameters
----------
shape : tuple
    shape of the array
dims : list of str, optional
    list of dimensions with same length as shape. The default will be
    dim_0, dim_1,...,etc
coordinate_initializer : optional
    function which returns the appropriate coordinates. The signature for
    this function must be coordinate_initializer(dim, dim_length). The
    default is to initialize all the coordinates with
    ``np.arange(dim_length)``
"""
pass

```

What would use suggest for the signature of a function like xr.ones?

I think the main reason why we don't have these helpers is that xr.DataArray(np.ones(3, 4), dims=['x', 'y']) is nearly as succinct

I suppose we could possibly do better now that newer versions of Python (3.6+) guarantee order for keyword arguments, so we could have something like xr.ones(x=3, y=4).