Change indexin() to return first rather than last matching index #25998
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That's more natural, and consistent with MATLAB's ismember() and R's match().
nalimilan
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StefanKarpinski
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Feb 11, 2018
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That's more natural, and consistent with MATLAB's
ismemberand R'smatch.See discussion at #25662 (comment).
If desired, breakage could be avoided by adding an optional argument to choose between the first and the last one. We would print a deprecation by default unless the argument is passed explicitly.