我有以下R数据帧:
zed
# A tibble: 10 x 3
jersey_number first_name statistics.minutes
<chr> <chr> <chr>
1 20 Marques 8:20
2 53 Brennan 00:00
3 35 Marvin 40:00
4 50 Justin 00:00
5 14 Jordan 00:00
6 1 Trevon 31:00
7 15 Alex 2:00
8 51 Mike 00:00
9 12 Javin 17:00
10 3 Grayson 38:00
> dput(zed)
structure(list(jersey_number = c("20", "53", "35", "50", "14",
"1", "15", "51", "12", "3"), first_name = c("Marques", "Brennan",
"Marvin", "Justin", "Jordan", "Trevon", "Alex", "Mike", "Javin",
"Grayson"), statistics.minutes = c("8:20", "00:00", "40:00",
"00:00", "00:00", "31:00", "2:00", "00:00", "17:00", "38:00")), row.names = c(NA,
-10L), class = c("tbl_df", "tbl", "data.frame"))
这是我从中接收数据的API数据的格式。所有列(共有约100个列)最初都是character
类的。要转换所有内容,我使用readr::type_convert()
,但是会发生以下错误:
> zed %>% readr::type_convert()
Parsed with column specification:
cols(
jersey_number = col_integer(),
first_name = col_character(),
statistics.minutes = col_time(format = "")
)
# A tibble: 10 x 3
jersey_number first_name statistics.minutes
<int> <chr> <time>
1 20 Marques 08:20
2 53 Brennan 00:00
3 35 Marvin NA
4 50 Justin 00:00
5 14 Jordan 00:00
6 1 Trevon NA
7 15 Alex 02:00
8 51 Mike 00:00
9 12 Javin 17:00
10 3 Grayson NA
如果此分钟专栏文章改为类==数字,我希望不要抛出错误并弄乱转换。如果该列的行显示“ 8:20”,我希望将其简单地转换为8.33。
关于如何实现此目标的任何想法-最好是允许我继续使用type_convert
的事物。
答案 0 :(得分:3)
library(lubridate)
读入df
,不要更改(您的dput
代码)。
在分钟数秒内增加小时数:
df$statistics.minutes <- paste0("00:", df$statistics.minutes)
转换为时间类型:
df$statistics.minutes <- lubridate::hms(df$statistics.minutes)
除以60:
period_to_seconds(df$statistics.minutes) / 60
结果:
[1] 8.333333 0.000000 40.000000 0.000000 0.000000
[6] 31.000000 2.000000 0.000000 17.000000 38.000000
根据需要替换为df
:
df$statistics.minutes <- period_to_seconds(df$statistics.minutes) / 60
[ OP的添加]:-)
基于此结果,我创建了以下帮助器函数-因此我可以在不中断管道链的情况下解决此问题:
fixMinutes <- function(raw.data) {
new.raw.data <- raw.data %>%
dplyr::mutate(statistics.minutes = paste0("00:", statistics.minutes)) %>%
dplyr::mutate(statistics.minutes = lubridate::hms(statistics.minutes)) %>%
dplyr::mutate(statistics.minutes = lubridate::period_to_seconds(statistics.minutes) / 60)
return(new.raw.data)
}
zed %>%
... %>%
fixMinutes() %>%
... %>%
答案 1 :(得分:2)
我唯一发生的事情是先将有问题的列转换为数字,例如
(zed
## split stats column in two, with names unlikely to clash w/ existing
%>% tidyr::separate(statistics.minutes,c("tmp...mins","tmp...secs"))
## explicitly convert
%>% dplyr::mutate(statistics.minutes=as.numeric(tmp...mins)+as.numeric(tmp...secs)/60)
## throw out the temp variables
%>% dplyr::select(-starts_with("tmp..."))
%>% readr::type_convert()
)
我不知道这是否满足您的“继续使用type_convert
”标准。将自定义转换函数传递给type_convert
会更优雅,但我不知道该怎么做。