Question

我想对数据帧df进行分组/分组

a <- c(1,2,3,4,5,6,7,8,9,10)
b <- c(10,20,30,40,50,60,70,80,90,100)
c <- c("a","a","b","b","b","a","a","b","c","c")
df <- data.frame(x_value=a, y_value=b, speed=c)

输入以在“速度”列上分隔数据帧，如下所示

   x_value y_value speed
1        1      10     a
2        2      20     a
****
3        3      30     b
4        4      40     b
5        5      50     b
****
6        6      60     a
7        7      70     a
****
8        8      80     b
****
9        9      90     c
10      10     100     c

所以我最终以df [1]，包含第1行和第2行，df [2]，包含第3、4和5行，等等。

Answer 1

我们需要NotFoundError: Expect status [200] from Google Storage. But got status 404. Path: '/darianhickman-201423.appspot.com/logo.jpg'. Request headers: None. Response headers: {'date': 'Sun, 30 Dec 2018 18:54:54 GMT', 'connection': 'close', 'server': 'Development/2.0'}. Body: ''. Extra info: None.和split来创建rleid个list

data.frame

要提取数据帧，请使用library(data.table) lst1 <- split(df, rleid(df$speed))

[[

或从lst1[[1]] lst1[[2]]

创建分组变量

base R

或使用grp <- cumsum(c(TRUE, df$speed[-1] != df$speed[-nrow(df)]))

创建分组变量

rle

拆分和分组数据框

1 个答案: