删除数据框中的周末数据

Question

从下面的数据框中可以看出，RBloomberg 返回周末日期的 NA。

如果它落在周末，我想删除整行。我该怎么做？

我不想使用 na.omit 因为如果/当我出于合法原因在数据中获得 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

Answer 1

将日期列转换为 POSIXlt ，例如

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

然后您可以使用访问星期几

date$wday

并适本地对框架进行子集化