add `pairwise-differences` method to compute distance matrix from a numeric metadata category

qiime2 / q2-metadata

BSD 3-Clause "New" or "Revised" License

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Closed gregcaporaso closed 6 years ago

gregcaporaso commented 7 years ago

This replaces qiime2/q2-diversity#95.

See the _metadata_distance function in q2-diversity. That should be ported and promoted to a method in this plugin.