使用OR时筛选器在数据帧(dplyr)上不起作用
使用OR时筛选器在数据帧(dplyr)上不起作用
提问于 2016-06-24 10:15:34
当我运行此命令时：filter(pitches, stand == "L", des == "Ball" | des == "Called Strike")
它似乎不起作用(请注意，标准列没有过滤)，我得到的结果是：
num gameday_link stand b_height px pz type des
(dbl) (chr) (chr) (chr) (dbl) (dbl) (chr) (chr)
1 21 gid_2016_04_09_houmlb_milmlb_1 R 5-11 0.710 2.256 S Called Strike
2 37 gid_2016_04_09_houmlb_milmlb_1 R 6-4 0.819 3.336 S Called Strike
3 33 gid_2016_04_14_milmlb_slnmlb_1 L 6-3 -0.458 4.464 B Ball
4 33 gid_2016_04_14_milmlb_slnmlb_1 L 6-3 -0.805 2.818 S Called Strike
5 17 gid_2016_04_19_milmlb_minmlb_1 L 5-10 -0.761 3.664 B Ball
6 17 gid_2016_04_19_milmlb_minmlb_1 L 5-10 -0.574 3.472 B Ball
7 17 gid_2016_04_19_milmlb_minmlb_1 L 5-10 -0.474 3.617 B Ball
8 17 gid_2016_04_19_milmlb_minmlb_1 L 5-10 -0.350 1.267 B Ball
9 50 gid_2016_04_19_milmlb_minmlb_1 L 6-0 -1.610 2.499 B Ball
10 50 gid_2016_04_19_milmlb_minmlb_1 L 6-0 -1.177 1.543 B Ball当我运行此命令时：filter(pitches, stand == "L", des == "Ball")
它起作用了，我得到了这个：
num gameday_link stand b_height px pz type des
(dbl) (chr) (chr) (chr) (dbl) (dbl) (chr) (chr)
1 33 gid_2016_04_14_milmlb_slnmlb_1 L 6-3 -0.458 4.464 B Ball
2 17 gid_2016_04_19_milmlb_minmlb_1 L 5-10 -0.761 3.664 B Ball
3 17 gid_2016_04_19_milmlb_minmlb_1 L 5-10 -0.574 3.472 B Ball
4 17 gid_2016_04_19_milmlb_minmlb_1 L 5-10 -0.474 3.617 B Ball
5 17 gid_2016_04_19_milmlb_minmlb_1 L 5-10 -0.350 1.267 B Ball
6 50 gid_2016_04_19_milmlb_minmlb_1 L 6-0 -1.610 2.499 B Ball
7 50 gid_2016_04_19_milmlb_minmlb_1 L 6-0 -1.177 1.543 B Ball
8 50 gid_2016_04_19_milmlb_minmlb_1 L 6-0 -1.072 1.091 B Ball
9 50 gid_2016_04_19_milmlb_minmlb_1 L 6-0 -0.987 3.506 B Ball
10 34 gid_2016_04_19_milmlb_minmlb_1 L 5-10 1.962 2.302 B Ball为什么会这样呢？
回答 1
Stack Overflow用户
发布于 2016-06-24 11:57:15
所以看起来dplyr的过滤器没有把逻辑参数放在括号里。
所以我的命令
filter(pitches, stand == "L", des == "Ball" | des == "Called Strike")
变成了
stand == "L" AND des == "Ball" OR des == "Called Strike"
正确的命令应该是
filter(pitches, stand == "L", (des == "Ball" | des == "Called Strike"))
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/38004652
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