r - Identifying Row Index Number on the Bases of Max Value of Other Column within Group_by - 


 g= c("p52" ,"p52","p66 - park ii","p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p82 v3","p82 v3","p82 v3","p52","p52","p66 - park ii" ,"p66 - park ii" ,"p82 v3","p66 - park ii" ,"p66 - park ii" ,"p82 v3","p82 v3"        ,"p88","p88","p88","p52","p82 v3","p66 - park ii" ,"p66 - park ii" ,"p82 v3","p52","p88","p88","p52" ,"p88","p82 v3","p88","p82 v3","p82 v3","p82 v3","p88","p88","p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p88","p66 - park ii" ,"p88"           ,"p52","p52","p52","p52","p52","p52","p66 - park ii" ,"p66 - park ii" ,"p66 - park ii","p88","p82 v3","p82 v3","p88","p88","p66 - park ii" ,"p66 - park ii" ,"p52","p52","p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii","p66 - park ii" ,"p82 v3","p66 - park ii" ,"p82 v3","p88","p82 v3","p88","p88","p66 - park ii","p82 v3","p82 v3" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p82 v3","p88","p88","p82 v3","p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p66 - park ii" ,"p88"           ,"p66 - park ii" ,"p66 - park ii","p66 - park ii" ) ga = runif(100, min=20, max=50) gl = runif(100, min=20, max=50)  df=data.frame(g=g,ga=ga,gl=gl) df$sq <- seq(1:nrow(df)) library(mass) library(dplyr) by_g<- group_by(df,g) fg1 <- summarise(by_g,                  row_index1=row_number(which.max(ga)),                  row_index2=row_number(which.max(gl)),                  n=n())

above reproducible code , trying extract row id number column ga has max value within group.

assuming sq refers row id in dataset, following give row id largest ga within each group g:

by_g %>% arrange(desc(ga)) %>% summarise(sq = first(sq))  # tibble: 4 × 2               g   sq          <fctr> <int> 1           p52    46 2 p66 - park ii    13 3        p82 v3    90 4           p88    55

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