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Page 41 of Rfast.pdf under details: "verion" ipo version
Details
The function applies "order" in a column or row-wise fashion or Order a vector. If you want the
same results as R’s, then set "stable=TRUE" because "stable=FALSE" uses a sorting algorithm that
it is not stable like R’s sort. But it is faster to use the default. This
"verion"
is faster for large data,
more than 300.