摘要: 生成数据: library(dplyr) set.seed(1) df <- expand.grid(list(A = 1:5, B = 1:5, C = 1:5)) df$value <- runif(nrow(df)) 情况 1:group_by + summarise df %>% group 阅读全文
posted @ 2022-04-19 11:02 橙子牛奶糖 阅读(1113) 评论(0) 推荐(0) 编辑