使用变量名称分配给数据框列。
getModified <- function(dframe, destination_string, foo, bar) {
# complex calculations on foo and bar getting mynewcol here
# ...
# I want to add mynewcolumn with name in destination_string
# if "blah" was the destination_string, the result would be as:
#dframe$blah <- mynewcol
#return(dframe)
# what is the syntax for using the variable?
# no luck here:
dframe[, destination_string] <- mynewcolumn
return(dframe)
}
这样我就可以打电话了
dframe <- getModified(dframe, "nameofmynewcolum", foo, bar)
dframe$nameofmynewcolumn
答案 0 :(得分:5)
语法是
dframe[[destination_string]] <- mynewcolumn
例如,
getModified <- function(dframe, destination_string, foo) {
dframe[[destination_string]] <- foo
dframe
}
> getModified(data.frame(A=1:10), "newColName", 11:20)
A newColName
1 1 11
2 2 12
3 3 13
4 4 14
5 5 15
6 6 16
7 7 17
8 8 18
9 9 19
10 10 20