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  • shoyer · 4 ✖

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  • Reshape function works only for numpy array and raise error with xarray variable. · 4 ✖

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455909044 https://github.com/pydata/xarray/issues/2676#issuecomment-455909044 https://api.github.com/repos/pydata/xarray/issues/2676 MDEyOklzc3VlQ29tbWVudDQ1NTkwOTA0NA== shoyer 1217238 2019-01-20T22:35:28Z 2019-01-20T22:35:28Z MEMBER

Generally you'll need to use Dask functions on .data if you want it to be lazy. On Sun, Jan 20, 2019 at 9:56 PM Ahmed Shaaban notifications@github.com wrote:

Thanks ... I am wondering if I used Numpy/Scipy functions on Xarray.data, will such computation is performed under the umbrella of Dask (Lazy evaluation)?

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   Reshape function works only for numpy array and raise error with xarray variable. 399309171
455704659 https://github.com/pydata/xarray/issues/2676#issuecomment-455704659 https://api.github.com/repos/pydata/xarray/issues/2676 MDEyOklzc3VlQ29tbWVudDQ1NTcwNDY1OQ== shoyer 1217238 2019-01-18T22:12:18Z 2019-01-18T22:12:18Z MEMBER

array_wrap is an old interface that a variety of NumPy functions use (in an apparently hard to predict ways). On Fri, Jan 18, 2019 at 10:07 PM Joe Hamman notifications@github.com wrote:

@ahmedshaaban1 https://github.com/ahmedshaaban1 - You may also want to checkout http://xarray.pydata.org/en/stable/computation.html#wrapping-custom-computation

@shoyer https://github.com/shoyer - can you expand on what you meant about removing the xarray.Variable.array_wrap method? xarray.DataArray also calls this method a few times so we'd have to think about how far to take this.

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   Reshape function works only for numpy array and raise error with xarray variable. 399309171
455427016 https://github.com/pydata/xarray/issues/2676#issuecomment-455427016 https://api.github.com/repos/pydata/xarray/issues/2676 MDEyOklzc3VlQ29tbWVudDQ1NTQyNzAxNg== shoyer 1217238 2019-01-18T04:50:57Z 2019-01-18T04:50:57Z MEMBER

In general you need to apply NumPy/scipy functions on the .data attribute of an xarray object, and recreate the labels. On Thu, Jan 17, 2019 at 10:54 PM Ahmed Shaaban notifications@github.com wrote:

Thanks a lot for your answer. I am a novice to Xarray, and I am a heavy user of NumPy. Numpy FFT function works fine with Xarray variables, yet it returns NumPy array. NumPy reshape function, as mentioned above, does not work with Xarray variable. I am not yet able to understand how to use the power of Xarray and at the same time be able to use the math/statistics function of Numpy/SciPy.

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   Reshape function works only for numpy array and raise error with xarray variable. 399309171
455180151 https://github.com/pydata/xarray/issues/2676#issuecomment-455180151 https://api.github.com/repos/pydata/xarray/issues/2676 MDEyOklzc3VlQ29tbWVudDQ1NTE4MDE1MQ== shoyer 1217238 2019-01-17T13:56:21Z 2019-01-17T13:56:21Z MEMBER

We should probably remove the xarray.Variable.__array_wrap__ method

 
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   Reshape function works only for numpy array and raise error with xarray variable. 399309171

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