在 R 的函数中传递 arguments

Question

So I'm trying to create a function which will take an argument from a list and return it into a dataframe. So far I got close with this sample code, but i've become stuck for a few weeks now.

 # list of pets pets = list("cats", "dogs") # comment link search_url = paste("https://duckduckgo.com/?q=", pets[]) # empty data frame for the pets petsX <- data.frame() # function for x in pets getSearch <- function(x) { petsX <- ( search_url [x] ) } getSearch(1) # I want this to be: # https://duckduckgo.com/?q=cats

Any help or guidance in the right direction would be truly appreciated.

Answer 1

I am not sure why you need the petsX dataframe at all. You already have all search terms in the list. It would probably be better if you store the results of the function in dataframe when you use it.

# list of pets
pets = list("cats", "dogs")

# comment link
search_url = paste("https://duckduckgo.com/?q=", pets, sep = "")

# function for x in pets
getSearch <- function(x) {
  search_url[[x]]
}

getSearch(1)
#> [1] "https://duckduckgo.com/?q=cats"
getSearch(2)
#> [1] "https://duckduckgo.com/?q=dogs"

^{Created on 2021-02-22 by the reprex package (v0.3.0)}