R: How to concatenate vectors of strings in a list of vectors

Question

I have a list of vectors of strings like this:

x=list(c("a","b"),"c",c("d","e","f"),c("gg","hh") )

I'd like to concatenate the vectors into single strings like this

y=c("ab","c","def","gghh")

I searched around but I couldn't find a similar example. Is there a smart way to do this without looping over the list elements?

acylam · Accepted Answer · 2018-06-29 17:02:16Z

6

With sapply:

y <- sapply(x, paste0, collapse = '')
# [1] "ab"   "c"    "def"  "gghh"

answered Jun 29, 2018 at 17:02

acylam

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1 Comment

IceCreamToucan Over a year ago

You probably know this already, but FYI for those interested, paste0 and paste will give the same result in cases like this where there's only one argument (other than collapse)

Fino · Accepted Answer · 2018-06-29 17:00:38Z

-1

It's not the most elegant solution but this works:

x=list(c("a","b"),"c",c("d","e","f"),c("gg","hh") )

y=NULL
for(i in 1:length(x)){
  y=c(y,paste0(x[[i]],collapse=""))
}

answered Jun 29, 2018 at 17:00

Fino

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