Answer by Vito Vanin for Fastest splitter?
PositionIndex[ ] seems to take half of the time of GatherBy[ ]. I use the the test case provided, but evaluate the time with GatherBy[ ], after the comment by MarcoB:splitGB = GatherBy[tabtest, Last];...
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Consider some datasetN1 = 13;N2 = 130*10^3;N3 = 2*10^4;tabtest = Join[Join[RandomReal[{0, 3}, {N1, 4}], Table[{1.}, N1], 2], Join[RandomReal[{0, 3}, {N2, 4}], Table[{2.}, N2], 2], Join[RandomReal[{0,...
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