dplyr mutate rowSums计算或自定义函数 [英] dplyr mutate rowSums calculations or custom functions
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问题描述
我正在尝试从排序计算中变换一个新变量,
表示 rowSums
如下
I'm trying to mutate a new variable from sort of row calculation,
say rowSums
as below
iris %>%
mutate_(sumVar =
iris %>%
select(Sepal.Length:Petal.Width) %>%
rowSums)
结果是sumVar被截断为第一个值(10.2):
the result is that "sumVar" is truncated to its first value(10.2):
Source: local data frame [150 x 6]
Groups: <by row>
Sepal.Length Sepal.Width Petal.Length Petal.Width Species sumVar
1 5.1 3.5 1.4 0.2 setosa 10.2
2 4.9 3.0 1.4 0.2 setosa 10.2
3 4.7 3.2 1.3 0.2 setosa 10.2
4 4.6 3.1 1.5 0.2 setosa 10.2
5 5.0 3.6 1.4 0.2 setosa 10.2
6 5.4 3.9 1.7 0.4 setosa 10.2
..
Warning message:
Truncating vector to length 1
应该是 rowwise
应用?或者在这些计算中使用什么正确的动词。
Should it be rowwise
applied? Or what's the right verb to use in these kind of calculations.
编辑:
更具体地说,有没有办法通过 dplyr
实现内联定制功能?
More specifically, is there any way to realize the inline custom function with dplyr
?
我想知道如果可能的话,请执行以下操作:
I'm wondering if it is possible do something like:
iris %>%
mutate(sumVar = colsum_function(Sepal.Length:Petal.Width))
推荐答案
解决方法,但可以使用
iris %>% mutate(sumVar = rowSums(.[1:4]))
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