rank2 data is slow because of copy of Java arrays

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rank2 data is slow because of copy of Java arrays #6

Open jbfaden opened 4 years ago

jbfaden commented 4 years ago

Masafumi asked that I look into a faster way to get a rank 2 nd-array from a rank 2 qdataset. Right now you can get the data as a 2-d float array, but to create the ndarray from this is slow.

See valuesAlias, which I believe was introduced for this sort of issue.