Answers for "r select first row of each group"

R

0

r first row by group

df <- data.frame(group=c("a", "b"), value=1:8)
## Order the data frame with the variable of interest
df <- df[order(df$value),]
## Aggregate
aggregate(df, list(df$group), FUN=head, 1)

Posted by: Guest on March-25-2020

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