9

从下面的数据框中可以看出,RBloomberg 返回周末日期的 NA。

如果它是在周末,我想删除整行。我该怎么做?

我不想使用na.omit,因为如果/当我出于正当理由在数据中获得 NA 时,这可能会删除工作日行。

   ticker       date yld_ytm_mid
1    R206 2011-05-11       6.946
2    R206 2011-05-12       6.969
3    R206 2011-05-13       7.071
4    R206 2011-05-14          NA
5    R206 2011-05-15          NA
6    R201 2011-05-11       7.201
7    R201 2011-05-12       7.213
8    R201 2011-05-13       7.323
9    R201 2011-05-14          NA
10   R201 2011-05-15          NA
11   R157 2011-05-11       7.611
12   R157 2011-05-12       7.622
13   R157 2011-05-13       7.718
14   R157 2011-05-14          NA
15   R157 2011-05-15          NA
16   R203 2011-05-11       8.165
17   R203 2011-05-12       8.170
18   R203 2011-05-13       8.279
19   R203 2011-05-14          NA
20   R203 2011-05-15          NA
21   R204 2011-05-11       8.303
22   R204 2011-05-12       8.296
23   R204 2011-05-13       8.386
24   R204 2011-05-14          NA
25   R204 2011-05-15          NA
26   R207 2011-05-11       8.361
27   R207 2011-05-12       8.371
28   R207 2011-05-13       8.479
29   R207 2011-05-14          NA
30   R207 2011-05-15          NA
31   R208 2011-05-11       8.392
32   R208 2011-05-12       8.393
33   R208 2011-05-13       8.514
34   R208 2011-05-14          NA
35   R208 2011-05-15          NA
36   R186 2011-05-11       8.546
37   R186 2011-05-12       8.571
38   R186 2011-05-13       8.664
39   R186 2011-05-14          NA
40   R186 2011-05-15          NA
41   R213 2011-05-11       8.783
42   R213 2011-05-12       8.802
43   R213 2011-05-13       8.898
44   R213 2011-05-14          NA
45   R213 2011-05-15          NA
46   R209 2011-05-11       8.785
47   R209 2011-05-12       8.807
48   R209 2011-05-13       8.898
49   R209 2011-05-14          NA
50   R209 2011-05-15          NA
51   R214 2011-05-11       8.841
52   R214 2011-05-12       8.861
53   R214 2011-05-13       8.958
54   R214 2011-05-14          NA
55   R214 2011-05-15          NA
4

3 回答 3

20

为了完整起见,我想补充一下blinjesse的回答,键入?weekdays表明R具有适用于posix和date类型的基本函数weekdays()、months()和quarters(),并且我相信是矢量化的,所以这个也可以:

!(weekdays(as.Date(date)) %in% c('Saturday','Sunday'))
于 2011-05-15T19:59:41.110 回答
19

将日期列转换为 POSIXlt ,例如

date <- as.POSIXlt(date,format="%Y-%m-%d")

然后您可以使用

date$wday

并适当地对框架进行子集化

于 2011-05-15T15:43:25.500 回答
4

blindJesse 的答案是正确且有用的,因为它回退到基本 R 函数。

许多包都有额外的辅助包装器。这是timeDate中的一个,它需要转换为它的类型:

R> isWeekend( as.timeDate( seq( as.Date("2011-01-01"), 
+                               to=as.Date("2011-01-07"), by=1 ) ) )
2011-01-01 2011-01-02 2011-01-03 2011-01-04 2011-01-05 2011-01-06 2011-01-07  
      TRUE       TRUE      FALSE      FALSE      FALSE      FALSE      FALSE  
R> 

这是使用RcppBDT中的函数的另一种方法:

R> sapply(seq(as.Date("2011-01-01"),to=as.Date("2011-01-07"), by=1),getDayOfWeek)
[1] 6 0 1 2 3 4 5
R> 
R> sapply(seq(as.Date("2011-01-01"),to=as.Date("2011-01-07"), by=1),getDayOfWeek)
+         %%6 == 0
[1]  TRUE  TRUE FALSE FALSE FALSE FALSE FALSE
R> 

lubridate包也有,而且毫无疑问,其他wday()包中还有更多的 he;per 功能。

于 2011-05-15T16:47:28.190 回答