使用dplyr、group_by、for创建一个for循环，并将每个变量的输出保存在一个列表中

install.packages("dplyr")

library(dplyr)

data <- data.frame(
  group = c("A", "A", "B", "B", "C", "C"),
  value = c(1, 2, 3, 4, 5, 6)
)

grouped_data <- group_by(data, group)

output_list <- list()

for (group_name in unique(data$group)) {
  group_data <- filter(grouped_data, group == group_name)
  output <- summarise(group_data, sum_value = sum(value))
  output_list[[group_name]] <- output
}

for (i in 1:length(output_list)) {
  cat("Group", names(output_list[i]), ":", output_list[[i]]$sum_value, "\n")
}

library(dplyr)

data <- data.frame(
  group = c("A", "A", "B", "B", "C", "C"),
  value = c(1, 2, 3, 4, 5, 6)
)

grouped_data <- group_by(data, group)
output_list <- list()

for (group_name in unique(data$group)) {
  group_data <- filter(grouped_data, group == group_name)
  output <- summarise(group_data, sum_value = sum(value))
  output_list[[group_name]] <- output
}

for (i in 1:length(output_list)) {
  cat("Group", names(output_list[i]), ":", output_list[[i]]$sum_value, "\n")
}