R : group_by and pmap a piecewise operation on each row per group (ifelse vs case_when)

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R : group_by and pmap a piecewise operation on each row per group (ifelse vs case_when)
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R : group_by and pmap a piecewise operation on each row per group (ifelse vs case_when)
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pmap a : operation R piecewise group row case_when) vs group_by on and per (ifelse each



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