将 time-point 列变成间隔

Question

我有一个 tibble 存储 time-point 数据：

data.frame(Time = c(0, 1, 2, 3, 4), readings = c(123, 234, 145, 234, 121))

我想将它变成如下所示的 table：

From	To	Initial	End
0	1	123	234
1	2	234	145
2	3	145	234
3	4	234	121
...	...	...	...

我更喜欢用R/tidyverse来完成，但是如果python可以用更简单的方式来完成，我也可以采用一些python代码。谢谢！

Answer 1

这个有用吗：

library(dplyr)

df %>% mutate(To = lead(Time), End = lead(readings)) %>% 
       select('From' = Time, To, 'Initial' = readings, End)
  From To Initial End
1    0  1     123 234
2    1  2     234 145
3    2  3     145 234
4    3  4     234 121

Answer 2

我们可以在 base R 中删除数据集的最后一行和第一行并重命名列

setNames(cbind(df1[-nrow(df1), ], df1[-1, ]),
     c("From", "Initial", "To", "End"))[c(1, 3, 2, 4)]
  From To Initial End
1    0  1     123 234
2    1  2     234 145
3    2  3     145 234
4    3  4     234 121

Answer 3

这是另一种 dplyr 方法：使用 across

df %>%
  mutate(across(everything(), lead, .names="end_{col}")) %>% 
  select(From=Time, To=end_Time, Initial=readings, End=end_readings)

  From To Initial End
1    0  1     123 234
2    1  2     234 145
3    2  3     145 234
4    3  4     234 121
5    4 NA     121  NA

将 time-point 列变成间隔

Turn a time-point column into intervals

python

r

intervals

tidyverse

tibble