CODEWITHSUNDEEP
rlistappend
alli
alli

Reputation: 19

How to append strings to a vector from a for loop?

I got a data frame that has a column with names separated by commas, I want to create a vector that includes each name independently inside but my solution didn't work. Need help with it.

library(tidyverse)

cast <- netflix_titles$cast
names <- c()
for(i in cast){
  splitted <- strsplit(i, ",")
  for(act in splitted){
    append(names, act)
  }
}

rows are in this format

"Jesse Eisenberg, Woody Harrelson, Emma Stone, Abigail Breslin, Amber Heard, Bill Murray, Derek Graf"

Upvotes: 0

Views: 43

Answers (1)

Jan
Jan

Reputation: 5254

You can get a vector of names with unlist(strsplit()). strsplit itself returns a list which you can turn into an atomic vector with unlist.

unlist(strsplit("Jesse Eisenberg, Woody Harrelson, Emma Stone, Abigail Breslin, Amber Heard, Bill Murray, Derek Graf", ", "))

#> [1] "Jesse Eisenberg" "Woody Harrelson" "Emma Stone"      "Abigail Breslin"
#> [5] "Amber Heard"     "Bill Murray"     "Derek Graf"

Hence, you can completely remove the for loop if you add unlist().

You can even do it for the whole column in the data frame:

df <- data.frame(cast = c(
  "Jesse Eisenberg, Woody Harrelson, Emma Stone, Abigail Breslin, Amber Heard, Bill Murray, Derek Graf",
  "Bruce Willis, Matt Damon, Brad Pitt"
))

unlist(strsplit(df$cast, ", "))

#> [1] "Jesse Eisenberg" "Woody Harrelson" "Emma Stone"      "Abigail Breslin"
#> [5] "Amber Heard"     "Bill Murray"     "Derek Graf"      "Bruce Willis"   
#> [9] "Matt Damon"      "Brad Pitt"

Upvotes: 1

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