今天发生了dplyr的奇怪事情。我有'数据',一个有4列的矩阵。这是一个社交网络:V2是由边缘连接的节点,并且V3是一些标签。我对这个数据集的统计数据感兴趣,所以我使用了dplyr。然而,发生了一件奇怪的事情 - 它给了我一些随机的结果......我没有看到在分组,整理和总结数据方面的随机性。你能告诉我在附加的例子中会发生什么?dplyr的随机性
谢谢!
library(dplyr)
library(magrittr)
> head(data)
V1 V2 V3 V4
[1,] "B1003" "B1051" "130000037751" "B"
[2,] "B1009" "B1054" "130000037751" "B"
[3,] "B1009" "B1033" "130000037751" "B"
[4,] "B1012" "B1036" "130000037751" "B"
[5,] "B1012" "B1066" "130000037751" "B"
[6,] "B1012" "6IIIBM" "130000037751" "B"
> data %>%
+ as.data.frame %>%
+ group_by("V3", "V4") %>%
+ summarise(count=n_distinct("V1")) %>%
+ arrange(., desc(count)) %>%
+ print
Source: local data frame [293 x 3]
Groups: V3
V3 V4 count
1 130000034371 A 179
2 130000014127 D 122
3 130000018500 A 112
4 130000028544 A 112
5 130000034057 E 108
6 130000061048 D 103
7 130000061048 A 100
8 130000042055 A 99
9 130000001997 D 98
10 130000042055 B 94
...
> data %>%
+ as.data.frame %>%
+ group_by("V3", "V4") %>%
+ summarise(count=n_distinct("V1")) %>%
+ arrange(., desc(count)) %>%
+ print
Source: local data frame [293 x 3]
Groups: V3
V3 V4 count
1 130000035777 B 129
2 130000064171 C 118
3 130000001997 D 110
4 130000034057 E 109
5 130000012718 G 95
6 130000017725 B 92
7 130000047614 B 89
8 130000005741 C 86
9 130000034037 C 78
10 130000028189 A 77
...
> data %>%
+ as.data.frame %>%
+ group_by("V3", "V4") %>%
+ summarise(count=n_distinct("V1")) %>%
+ arrange(., desc(count)) %>%
+ print
Source: local data frame [293 x 3]
Groups: V3
V3 V4 count
1 130000034371 A 162
2 130000036173 A 134
3 130000060230 E 114
4 130000060230 B 105
5 130000061592 C 99
6 130000001997 D 98
7 130000057531 B 95
8 130000028447 F 85
9 130000064171 C 85
10 130000057531 A 83
.. ... .. ...
是的,问题在于代码不会改变,结果是。这是我的担忧。 – Tim 2014-08-28 10:45:53