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[英]how to create a new list of data.frames by systematically rearranging columns from an existing list of data.frames
[英]Create a new list of data frames from an existing list of data frames
d1 <- data.frame(id = c("a", "b", "c"), val = c(111, 444, 777), month = c( "jan", "Jan" , "jan" ))
d2 <- data.frame(id = c("a", "b", "c"), val = c(222, 555, 888), month = c( "feb", "feb" , "feb" ))
d3 <- data.frame(id = c("a", "b", "c"), val = c(333, 666, 999), month = c( "mar", "mar" , "mar" ))
old.list <- list(d1, d2, d3)
s1 <- data.frame(id = c("a", "a", "a"), val = c(111, 222, 333), month = c( "jan", "feb" , "mar" ))
s2 <- data.frame(id = c("b", "b", "b"), val = c(444, 555, 666), month = c( "Jan", "feb" , "mar" ))
s3 <- data.frame(id = c("c", "c", "c"), val = c(777, 888, 999), month = c( "Jan", "feb" , "mar" ))
new.list <- list(s1, s2, s3)
'old.list' 中的所有數據框都具有相同的大小和相同的唯一 ID。 我正在嘗試將“old.list”轉換為每個唯一 ID 的時間序列,其中“月”是時間戳,即“new.list”,而不使用 for 循環。
附加說明,“old.list”中每個數據框的第 n 行被組合起來為“new.list”創建新的數據框,提前致謝。
在基礎 R 中,您可以rbind
列表元素並按 id split
:
new.list <- do.call(rbind, old.list)
new.list <- split(new.list, new.list$id)
假設你所有的系列在一月份開始,這應該有效:
(如果不查看 ts 的開始參數)
d1 <- data.frame(id = c("a", "b", "c"), val = c(111, 444, 777), month = c( "jan", "Jan" , "jan" ))
d2 <- data.frame(id = c("a", "b", "c"), val = c(222, 555, 888), month = c( "feb", "feb" , "feb" ))
d3 <- data.frame(id = c("a", "b", "c"), val = c(333, 666, 999), month = c( "mar", "mar" , "mar" ))
old.list <- list(d1, d2, d3)
d <- Reduce(rbind,old.list)
d <- split(d$val, d$id)
lapply(d, ts, frequency = 12)
#> $a
#> Jan Feb Mar
#> 1 111 222 333
#>
#> $b
#> Jan Feb Mar
#> 1 444 555 666
#>
#> $c
#> Jan Feb Mar
#> 1 777 888 999
由代表 package (v0.3.0) 於 2021 年 3 月 12 日創建
這是一個tidyverse
方法:
d1 <- data.frame(id = c("a", "b", "c"), val = c(111, 444, 777), month = c( "jan", "Jan" , "jan" ))
d2 <- data.frame(id = c("a", "b", "c"), val = c(222, 555, 888), month = c( "feb", "feb" , "feb" ))
d3 <- data.frame(id = c("a", "b", "c"), val = c(333, 666, 999), month = c( "mar", "mar" , "mar" ))
old.list <- list(d1, d2, d3)
library(dplyr)
library(purrr)
old.list %>%
reduce(rbind, by = 'id') %>%
filter(id != 'id') %>%
group_split(id)
#> [[1]]
#> # A tibble: 3 x 3
#> id val month
#> <chr> <chr> <chr>
#> 1 a 111 jan
#> 2 a 222 feb
#> 3 a 333 mar
#>
#> [[2]]
#> # A tibble: 3 x 3
#> id val month
#> <chr> <chr> <chr>
#> 1 b 444 Jan
#> 2 b 555 feb
#> 3 b 666 mar
#>
#> [[3]]
#> # A tibble: 3 x 3
#> id val month
#> <chr> <chr> <chr>
#> 1 c 777 jan
#> 2 c 888 feb
#> 3 c 999 mar
由代表 package (v0.3.0) 於 2021 年 3 月 12 日創建
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