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Ran 05 Jun 2020 02:48PM UTC

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Committed 05 Jun 2020 02:38PM UTC coverage: 81.737% (+0.6%) from 81.094%

Job # 481.3

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Commit Message

Add adjacency_matrix functions (#75)

* Add adjacency_matrix functions

This commit adds 2 new functions to the retworkx module,
graph_adjacency_matrix and dag_adjacency_matrix for returing the
adjacency matrix as a numpy array for PyGraph and PyDAG respectively.

* Add tests

* Add docs

* Use into_pyarray instead of to_pyarray

Previously the new functions here were using .to_pyarray() which will
take the rust side array allocate a new numpy array on the python heap
and then copy the elements to that new numpy array. This can get
inefficient for large matrixes because it has to copy each element.
Instead we can leverage .into_pyarray() which creates a numpy array with
a pointer to the array in the rust heap (which is not at all a confusing
distinction for a 2 character difference). This commit makes the change
to ensure the conversion to numpy doesn't become a bottleneck.

* Add more tests and document index hole edge-case

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