函数写通过列参考group_by [英] Function writing passing column reference to group_by
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问题描述
没有定义一个函数,以下工作:
sum_stat< - data%>%
group_by(column)%>%
summarise_each(funs(mean),var1:var20)
以下函数表单不起作用:
sum_stat< - function数据,列){
data%>%
group_by(column)%>%
summarise_each(funs(mean),var1:var20)
}
sum_stat(data,column)
返回的错误消息是:
错误:未知列'列'
解决方案
这样做:
foo< - function(data,column){
data%>%
group_by _(。dots = column)%>%
summarise_each(funs(mean))
}
foo(mtcars,cyl)
foo mtcars,gear)
I'm very new to R. Trying to define a function that groups a data set (group_by) and then creates summary statistics based on the groupings (dplyr, summarise_each).
Without defining a function the following works:
sum_stat <- data %>%
group_by(column) %>%
summarise_each(funs(mean), var1:var20)
The following function form does not work:
sum_stat <- function(data, column){
data %>%
group_by(column) %>%
summarise_each(funs(mean), var1:var20)
}
sum_stat(data, column)
The error message returned is:
Error: unknown column 'column'
解决方案
This is the usual way you'd do this:
foo <- function(data,column){
data %>%
group_by_(.dots = column) %>%
summarise_each(funs(mean))
}
foo(mtcars,"cyl")
foo(mtcars,"gear")
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