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Method: [keysA, keysB] = proxyKeys (a, b)

Computes proxy key values for two datetime arrays. Proxy keys are numeric values whose rows have the same equivalence relationships as the elements of the inputs.

This is primarily for Tablicious’s internal use; users will typically not need to call it or know how it works.

Returns two 2-D numeric matrices of size n-by-k, where n is the number of elements in the corresponding input.