将 function 应用于嵌套列表的每个元素 r

Question

I have a function like this:

a <- list()
a$prod_1 <- c(1,2,3)
a$prod_2 <- c(4,5,6)

and I want to exponentiante each element of the list I tried something like this:

exp_a <- lapply(a, funtion(x) e^x)

Answer 1

e doesn't exist as a constant in R, but the exp onential function does.
Just use exp_a <- lapply(a, exp)

Answer 2

You have a couple of ways to make it, while below are just two examples:

exp_a <- Map(exp,a)

or

exp_a <- as.list(as.data.frame(exp(do.call(cbind,a))))

Answer 3

We can use map from purrr

library(purrr)
map(a, exp)