CODEWITHSUNDEEP
r
FraMa
FraMa

Reputation: 37

R - add string to list

if have a vector (given) of words and I want to add the words to another vector, when a string starts with a vowel:

given = c("abc","def","oba") 
expected=c("abc","oba")

I use the following code in R:

expected=""
given = c("abc","def","oba")


for (i in  1:length(given)){
  start=substring(given[i], 1, 1)
  if(start == "a" ||start == "e"|| start == "i" ||start == "o" ||start == "u")
  {
  expected[i]<-given[i]

  }
  else
  {
    ""
  }
}

The out is:

[1] "abc" NA    "oba

And I wanted to have

[1] "abc" "oba

Can anyone help me to have a vector created without the NA?

How would I do that with a list?

Upvotes: 0

Views: 252

Answers (1)

Tim Biegeleisen
Tim Biegeleisen

Reputation: 520898

You may use grepl here:

given <- c("abc", "def", "oba")
expected <- given[grepl("^[aeiou]", given, ignore.case=TRUE)]
expected

[1] "abc" "oba"

The regex pattern ^[aeiou] will match any string beginning with a vowel letter (either uppercase or lowercase).

Upvotes: 1

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