我有一个如下所示的数据框:
created_at actor_attributes_email type
3/11/12 7:28 jeremy@asynk.ch PushEvent
3/11/12 7:28 jeremy@asynk.ch PushEvent
3/11/12 7:28 jeremy@asynk.ch PushEvent
3/11/12 7:42 jeremy@asynk.ch IssueCommentEvent
3/11/12 11:06 d.bussink@gmail.com PushEvent
3/11/12 11:06 d.bussink@gmail.com PushEvent
现在我想按月/年重新排列它(仍然按时间排序,仍然保持行的完整性)。这应该为每个月创建3列,然后将与该月相关的所有数据(created_at,actor_attributes_email和& type)放在这3列中,以便获得以下标题(对于数据中存在的所有月份) :
april_2011_created_at april_2011_actor_attributes_email april_2011_type may_2011_created_at may_2011_actor_attributes_email may_2011_type
我如何在R?
中完成此任务可以在此处找到包含整个数据集的CSV文件: https://github.com/aronlindberg/VOSS-Sequencing-Toolkit/blob/master/rubinius_rubinius_sequencing/rubinius_6months.csv
以下是CSV的第一行dput()
:
structure(list(created_at = structure(c(1L, 1L, 1L, 2L, 2L, 2L,
3L, 3L, 3L, 4L, 4L, 4L, 5L, 5L, 5L, 6L, 6L, 6L, 7L, 7L, 7L, 8L,
8L, 8L, 9L, 9L, 9L, 10L, 10L, 10L), .Label = c("2012-03-11 07:28:04",
"2012-03-11 07:28:19", "2012-03-11 07:42:16", "2012-03-11 11:06:13",
"2012-03-11 12:46:25", "2012-03-11 13:03:12", "2012-03-11 13:12:34",
"2012-03-11 13:14:52", "2012-03-11 13:30:14", "2012-03-11 13:30:48"
), class = "factor"), actor_attributes_email = structure(c(3L,
3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 2L, 2L, 2L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), .Label = c("",
"d.bussink@gmail.com", "jeremy@asynk.ch"), class = "factor"),
type = structure(c(2L, 2L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 2L,
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L,
2L, 2L, 2L, 2L, 2L), .Label = c("IssueCommentEvent", "PushEvent"
), class = "factor")), .Names = c("created_at", "actor_attributes_email",
"type"), class = "data.frame", row.names = c(NA, -30L))
其他一些假设是:
答案 0 :(得分:4)
library(plyr)
library(lubridate)
df$created_at <- ymd_hms(df$created_at, quiet = TRUE)
df$mname <- as.character(lubridate::month(df$created_at,label = T, abbr = T))
result <- dlply(df, .(mname), function(x){
x <- arrange(x, created_at)
names(x) <- paste0(unique(x$mname), "_", names(x))
x$mname <- NULL
x
}, .progress = 'text')
final_result <- ldply(result, rbind.fill)[, -1]
请注意,由于您希望将月份名称附加到3个列名称并填入相应的数据,因此没有数据的所有列都将填充NA
s(这是预期的行为) rbind.fill
)。
答案 1 :(得分:4)
Maiasaura提供了一种优雅的方式来完成plyr和lubridate的工作。这是在R基础上完成它的稍微不那么优雅的方法。但与Maiasaura的不同,这种方式可以最大限度地减少NA
行的数量。每个月的NA
行数是该月份的行数与任何月份的最大行数之间的差异。
# split df by month
by.mon <- split(df, months(as.POSIXct(df$created_at)))
# rename the columns to include the month name
by.mon <- mapply(
function(x, mon.name) {
names(x) <- paste(mon.name, names(x), sep='_');
return(x)
}, x=by.mon, mon.name=names(by.mon), SIMPLIFY=FALSE)
# add an index column for merging on
by.mon.indexed <- lapply(by.mon, function(x) within(x, index <- 1:nrow(x)))
# merge all of the months together
results <- Reduce(function(x, y) merge(x, y, by='index', all=TRUE, sort=FALSE),
by.mon.indexed)
# remove the index column
final_result <- results[names(results) != 'index']