tidyr 收集:同时收集和重命名密钥? [英] tidyr gather: simultaneously gather and rename key?
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问题描述
假设我有以下数据框:
> a <- data_frame(my_type_1_num_widgets = c(1, 2, 3), my_type_2_num_widgets = c(4, 5, 6))
> a
Source: local data frame [3 x 2]
my_type_1_num_widgets my_type_2_num_widgets
1 1 4
2 2 5
3 3 6
我想做两件事:
- 收集num_widgets"列.
- 重命名生成的键以删除num_widgets"后缀.
我目前这样做的方式,以及我得到的正确/期望的输出:
The way I'm doing this currently, and the correct/desired output that I'm getting:
> a %>%
rename(my_type_1 = my_type_1_num_widgets,
my_type_2 = my_type_2_num_widgets) %>%
gather(type, num_widgets, my_type_1:my_type_2)
Source: local data frame [6 x 2]
type num_widgets
1 my_type_1 1
2 my_type_1 2
3 my_type_1 3
4 my_type_2 4
5 my_type_2 5
6 my_type_2 6
有没有办法一步做到这一点?
Is there a way to do this in one step?
推荐答案
尝试:
a %>%
gather(type, num_widgets) %>% ## gather the "num_widgets" columns
mutate(type = sub("_num_widgets", "", type)) ## remove the suffix
给出:
#Source: local data frame [6 x 2]
#
# type num_widgets
#1 my_type_1 1
#2 my_type_1 2
#3 my_type_1 3
#4 my_type_2 4
#5 my_type_2 5
#6 my_type_2 6
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