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  • asarray Compatibility · 2 ✖

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116412391 https://github.com/pydata/xarray/issues/448#issuecomment-116412391 https://api.github.com/repos/pydata/xarray/issues/448 MDEyOklzc3VlQ29tbWVudDExNjQxMjM5MQ== shoyer 1217238 2015-06-29T03:26:39Z 2015-06-29T03:26:39Z MEMBER

Xray doesn't use numpy ndarray subclasses, mostly because that would tie our underlying array implementations to numpy and stop us from using interesting alternative array implementations like dask. Hence, np.asanyarray does not work either.

 
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   asarray Compatibility 91676831
116406425 https://github.com/pydata/xarray/issues/448#issuecomment-116406425 https://api.github.com/repos/pydata/xarray/issues/448 MDEyOklzc3VlQ29tbWVudDExNjQwNjQyNQ== shoyer 1217238 2015-06-29T03:13:33Z 2015-06-29T03:13:33Z MEMBER

Unfortunately, there's no way to make np.asarray return anything other than a numpy array without metadata -- that's kind of the entire point of asarray.

We do have some other options, though. The first two already work: - use xray.Dataset.apply to call a function, e.g., ds.apply(db2w) - write a numpy universal function using numba:

python @numba.vectorize def db2w(arr): return 10 ** (arr / 20.0) - we could write a modified version of asarray that passes through xray objects - we could write a decorator that transforms a function to preserve/restore xray metadata, e.g.,

``` python def keep_metadata(func): def wrapper(array, **kwargs): return array.array_wrap(func(array)) return wrapper

@keep_metadata def db2w(arr): return 10 ** (np.asarray(arr) / 20.0) ```

 
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   asarray Compatibility 91676831

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