通过关注其他变量的范围来创建新变量

Creating new variable by focusing range of other variables

我想创建一个变量，其中包含 (startyear) 和 (endyear - 1) 之间的所有数字。我的数据如下所示：

country leader startyear endyear
US Eisenhower 1953 1961
US Kennedy 1961 1963

我想这样显示我的数据：

country leader startyear endyear year
US Eisenhower 1953 1961 1953
US Eisenhower 1953 1961 1954
US Eisenhower 1953 1961 1955
US Eisenhower 1953 1961 1956
US Eisenhower 1953 1961 1957
US Eisenhower 1953 1961 1958
US Eisenhower 1953 1961 1959
US Eisenhower 1953 1961 1960
US Kennedy 1961 1963 1961
US Kennedy 1961 1963 1962

我的数据集中有很多国家。我想用“the”代码操作所有数据集。

我们可以按行和 unnest list 列

得到序列 (:) 
library(dplyr)
library(purrr)
library(tidyr)
df1 %>%
   mutate(year = map2(startyear, endyear-1, `:`)) %>%
   unnest(year)

-输出

# A tibble: 10 × 5
   country leader     startyear endyear  year
   <chr>   <chr>          <int>   <int> <int>
 1 US      Eisenhower      1953    1961  1953
 2 US      Eisenhower      1953    1961  1954
 3 US      Eisenhower      1953    1961  1955
 4 US      Eisenhower      1953    1961  1956
 5 US      Eisenhower      1953    1961  1957
 6 US      Eisenhower      1953    1961  1958
 7 US      Eisenhower      1953    1961  1959
 8 US      Eisenhower      1953    1961  1960
 9 US      Kennedy         1961    1963  1961
10 US      Kennedy         1961    1963  1962

数据

df1 <- structure(list(country = c("US", "US"), leader = c("Eisenhower", 
"Kennedy"), startyear = c(1953L, 1961L), endyear = c(1961L, 1963L
)), class = "data.frame", row.names = c(NA, -2L))