r first row by group
library(dplyr)
data <- data.frame(group = c("A", "A", "B", "B", "B"),
value = c(1, 2, 3, 4, 5))
result <- data %>%
group_by(group) %>%
summarize(first_value = first(value))
library(dplyr)
data <- data.frame(group = c("A", "A", "B", "B", "B"),
value = c(1, 2, 3, 4, 5))
result <- data %>%
group_by(group) %>%
summarize(first_value = first(value))