日期上的dplyr过滤器

Question

我的tbl_df:

    > p2p_dt_SKILL_A%>%
    + select(Patch,Date,Prod_DL)%>%
    + head()
      Patch       Date Prod_DL
    1  P1 2015-09-04    3.43
    2 P11 2015-09-11    3.49
    3 P12 2015-09-18    3.45
...
    4 P13 2015-12-06    3.57
    5 P14 2015-12-13    3.43
    6 P15 2015-12-20    3.47

我想rows根据日期选择所有,例如,如果Date大于2015-09-04和小于2015-09-18

结果应该是:

      Patch       Date          Prod_DL
      P1        2015-09-04    3.43
      P11       2015-09-11    3.49

我尝试了以下但它返回空的空向量.

p2p_dt_SKILL_A%>%
                select(Patch,Date,Prod_DL)%>%
                filter(Date > "2015-09-04" & Date <"2015-09-18")

回报:

> p2p_dt_SKILL_A%>%
+                 select(Patch,Date,Prod_DL)%>%
+                 filter(Date > 2015-09-12 & Date <2015-09-18)
Source: local data table [0 x 3]

Variables not shown: Patch (fctr), Date (date), Prod_DL (dbl)

还尝试了引号.

并使用 lubridate

p2p_dt_SKILL_A%>%
                select(Patch,Date,Prod_DL)%>%
                #filter(Date > 2015-09-12 & Date <2015-09-18)%>%
                filter(Patch %in% c("BVG1"),month(p2p_dt_SKILL_A$Date) == 9)%>%
                arrange(Date)

但这给了我整个九月的数据.

是否有一种更有效的方法,比如在类型变量上使用between运算符？dplyrDate

Answer 1

如果日期格式正确date,您的第一次尝试工作:

p2p_dt_SKILL_A <-read.table(text="Patch,Date,Prod_DL
P1,9/4/2015,3.43
P11,9/11/2015,3.49
P12,9/18/2015,3.45
P13,12/6/2015,3.57
P14,12/13/2015,3.43
P15,12/20/2015,3.47
",sep=",",stringsAsFactors =FALSE, header=TRUE)

p2p_dt_SKILL_A$Date <-as.Date(p2p_dt_SKILL_A$Date,"%m/%d/%Y")

p2p_dt_SKILL_A%>%
                select(Patch,Date,Prod_DL)%>%
                filter(Date > "2015-09-04" & Date <"2015-09-18")
  Patch       Date Prod_DL
1 P11 2015-09-11    3.49

UPDATE

如果数据类型仍然有效tbl_df.

p2p_dt_SKILL_A <-tbl_df(p2p_dt_SKILL_A)

p2p_dt_SKILL_A%>%
                select(Patch,Date,Prod_DL)%>%
                filter(Date > "2015-09-04" & Date <"2015-09-18")
Source: local data frame [1 x 3]

  Patch       Date Prod_DL
  (chr)     (date)   (dbl)
1 P11 2015-09-11    3.49

Answer 2

另一个更详细的选项是使用该函数between,x> = left&x <= right的快捷方式.我们需要更改=占用标志的日期,并使用as.Date(此处说明).

p2p_dt_SKILL_A%>%
                select(Patch,Date,Prod_DL)%>%
                filter(between(Date, as.Date("2015-09-05"),as.Date("2015-09-17")))