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  • Plotting tripolar dataset in xarray · 4 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
485952069 https://github.com/pydata/xarray/issues/2915#issuecomment-485952069 https://api.github.com/repos/pydata/xarray/issues/2915 MDEyOklzc3VlQ29tbWVudDQ4NTk1MjA2OQ== fabienpaulot 42008691 2019-04-23T19:59:49Z 2019-04-23T19:59:49Z NONE

Perfect. Thanks for the clear explanation. This fixes my issue. Fabien

On Tue, Apr 23, 2019 at 2:50 PM Spencer Clark notifications@github.com wrote:

Thanks @fabienpaulot https://github.com/fabienpaulot -- this could probably use a better error message. The arguments passed to x and y must be dimension or coordinate names of the DataArray rather than DataArrays themselves. In your case you can assign xcntr and ycntr as coordinates of test and then plot:

test = test.assign_coords(x=xcntr.rename({'nxp': 'xh', 'nyp': 'yh'}), y=ycntr.rename({'nxp': 'xh', 'nyp': 'yh'})) test['nh4_stf'].plot.contourf(x='x', y='y', ax=ax, transform=ccrs.PlateCarree())

The renaming is necessary so the dimension names match that of test.

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   Plotting tripolar dataset in xarray 436311057
485928903 https://github.com/pydata/xarray/issues/2915#issuecomment-485928903 https://api.github.com/repos/pydata/xarray/issues/2915 MDEyOklzc3VlQ29tbWVudDQ4NTkyODkwMw== spencerkclark 6628425 2019-04-23T18:50:19Z 2019-04-23T18:50:19Z MEMBER

Thanks @fabienpaulot -- this could probably use a better error message. The arguments passed to x and y must be dimension or coordinate names of the DataArray rather than DataArrays themselves. In your case you can assign xcntr and ycntr as coordinates of test and then plot:

python test = test.assign_coords(x=xcntr.rename({'nxp': 'xh', 'nyp': 'yh'}), y=ycntr.rename({'nxp': 'xh', 'nyp': 'yh'})) test['nh4_stf'].plot.contourf(x='x', y='y', ax=ax, transform=ccrs.PlateCarree())

The renaming is necessary so the dimension names match that of test.

 
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   Plotting tripolar dataset in xarray 436311057
485920496 https://github.com/pydata/xarray/issues/2915#issuecomment-485920496 https://api.github.com/repos/pydata/xarray/issues/2915 MDEyOklzc3VlQ29tbWVudDQ4NTkyMDQ5Ng== fabienpaulot 42008691 2019-04-23T18:26:46Z 2019-04-23T18:26:46Z NONE

Thanks

print(test)

<xarray.Dataset> Dimensions: (xh: 720, yh: 576) Coordinates: * xh (xh) float64 -299.8 -299.2 -298.8 -298.2 ... 58.75 59.25 59.75 * yh (yh) float64 -77.91 -77.72 -77.54 -77.36 ... 89.47 89.68 89.89 Data variables: nh4_stf (yh, xh) float32 nan nan nan nan nan nan ... nan nan nan nan nan

I am getting an error if I pass x and y

test['nh4_stf'].plot.contourf(x=xcntr,y=ycntr,ax=ax,transform=ccrs.PlateCarree()) ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

 
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   Plotting tripolar dataset in xarray 436311057
485917822 https://github.com/pydata/xarray/issues/2915#issuecomment-485917822 https://api.github.com/repos/pydata/xarray/issues/2915 MDEyOklzc3VlQ29tbWVudDQ4NTkxNzgyMg== rabernat 1197350 2019-04-23T18:19:48Z 2019-04-23T18:19:48Z MEMBER

You will need to add the x and y keyword arguments to contour. See the example from the xarray docs: http://xarray.pydata.org/en/latest/examples/multidimensional-coords.html

Could you also include the output of print(test)?

 
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   Plotting tripolar dataset in xarray 436311057

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