我正在处理 ar 数据框，如下所示。
id date items price
10 2014/09/13 shoes 187
10 2014/09/13 belt 35
10 2014/09/14 shirt 69
12 2014/10/01 dress 58
12 2014/10/01 bag 118
12 2015/01/03 shoes 115
purchase = structure(list(id = c(10, 10, 10, 12, 12, 12), date = structure(c(1L,
1L, 2L, 3L, 3L, 4L), .Label = c("2014/09/13", "2014/09/14", "2014/10/01",
"2015/01/03"), class = "factor"), name = structure(c(5L, 2L,
4L, 3L, 1L, 5L), .Label = c("bag", "belt", "dress", "shirt",
"shoes"), class = "factor"), price = c(187, 35, …我试图使用R从字符串中删除最后一个尾随下划线(_)
例如,
Col1
TX_
AZ_TX
CA_LX
CHI_
KS_
上面的字符串应该是这样的
Col1
TX
AZ_TX
CA_LX
CHI
KS
只有尾随_消失了.我试过sub("_", "", my_dataframe$my_column)但这会从字符串中删除所有_.我只是在寻找一个删除最后尾随_而不是全部的函数.有任何想法吗 ？
我有一个数据框df如下.
Id ProcessDate
10 2011-12-29 14:14:00
11 2011-12-29 14:16:00
12 2011-12-29 14:14:00
13 2011-12-29 14:20:00
14 2011-12-29 14:49:00
15 2011-12-29 14:51:00
16 2011-12-29 14:53:00
17 2011-12-29 15:11:00
18 2011-12-29 15:13:00
19 2011-12-29 15:10:00
20 2011-12-29 15:21:00
21 2011-12-29 14:34:00
22 2011-12-29 15:26:00
我正在尝试创建第三列Status,{Before, during , after }根据此条件包含这三个值中的任何一个.
if (df$ProcessDate < 2011-12-29 14:48:00)
then df$Status = "Before"
else if (df$ProcessDate > 2011-12-29 14:48:00 & df$ProcessDate < 2011-12-29 15:16:00)
then df$Status = "Between"
else df$Status = …