将数据框的行作为参数传递给 R 中的函数，其中列名指定参数

Question

I want to use the rows of a dataframe as arguments for a function. I know this can be done like this:

 arg <- expand.grid(n = 100, mean = -1:1, sd = 0:3)

 apply(arg, 1, FUN = function(x) rnorm(x[1], x[2], x[3]))

I would like, however, to have a more general, elegant way to pass the arguments using the column names of a dataframe to specify them (if the colum names is not an option, the order of the columns will do it as well).

I don't want to specify in every function which column refers to each argument, as I have done in the example above. Also, I would like to pass the values to functions with arbitrary number of arguments.

Answer 1

我们可以使用Map

do.call(Map, c(f= rnorm, arg))