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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
177338857 https://github.com/pydata/xarray/issues/733#issuecomment-177338857 https://api.github.com/repos/pydata/xarray/issues/733 MDEyOklzc3VlQ29tbWVudDE3NzMzODg1Nw== wilhelmsen 242610 2016-01-30T23:41:47Z 2016-01-30T23:41:47Z NONE

I also find it useful, now that I understand it.

But I also find it useful to know if the xarray coordinate is a netcdf coordinate or netcdf dimension: "A variable with the same name as a dimension is called a coordinate variable". But I guess that is the same as "indicating that xarray created the coordinate itself", as @shoyer mentioned above?

 
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   coordinate variable not written in netcdf file in some cases 129630652
176884522 https://github.com/pydata/xarray/issues/722#issuecomment-176884522 https://api.github.com/repos/pydata/xarray/issues/722 MDEyOklzc3VlQ29tbWVudDE3Njg4NDUyMg== wilhelmsen 242610 2016-01-29T17:48:15Z 2016-01-29T17:48:15Z NONE

Thank you!

I was just wondering how you know then, which one is an "actual" coordinate and which one is an indexed ("default") coordinate?

xarray seem to know this.

Example:

``` In [1]: import xray as xr

In [2]: import numpy as np

In [3]: var1 = xr.DataArray(np.array([1, 2], np.float64), coords=[np.array([1, 2], np.int64)], dims=["coor1",], name = "var1")

In [4]: var2 = xr.DataArray(np.array([3, 4], np.float64), dims=["dim1",], name = "var2")

In [5]: ds.var1 Out[5]: <xray.DataArray 'var1' (coor1: 2)> array([ 1., 2.]) Coordinates: * coor1 (coor1) int64 1 2

In [6]: ds.var2 Out[6]: <xray.DataArray 'var2' (dim1: 2)> array([ 3., 4.]) Coordinates: * dim1 (dim1) int64 0 1

In [7]: ds.var1.coords Out[7]: Coordinates: * coor1 (coor1) int64 1 2

In [8]: ds.var2.coords Out[8]: Coordinates: * dim1 (dim1) int64 0 1

In [9]: ds.to_netcdf("/tmp/from_xr.nc") ```

And then

``` $ ncdump /tmp/from_xr.nc netcdf from_xr { dimensions: coor1 = 2 ; dim1 = 2 ; variables: int64 coor1(coor1) ; double var1(coor1) ; double var2(dim1) ; data:

coor1 = 1, 2 ;

var1 = 1, 2 ;

var2 = 3, 4 ; } ```

As dim1 is not written in the file, xarray somehow knows?

 
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   All dimmensions become coordinates? 128528319

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