No discussion of making ST more efficient would be complete without mentioning the Guttman-Rosler Transform. GRT is similar to your idea, except it modifies the representation of the data (using pack and unpack) to use less memory or to make the sort simpler.

In reply to Re: An APL trick for the Schwartzian Transform by VSarkiss
in thread An APL trick for the Schwartzian Transform by dingus

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