[R] : record which entry in one file doesn't appear in a different file

Patrizio Frederic frederic.patrizio at gmail.com
Wed Feb 25 17:41:15 CET 2009

hey Laura,
I hope this help

f1 = c("a","b","c")
f2 = c("b","a","c","d")
f3 = match(f2,f1,0)
f4 = ifelse(f3>0,"yes","no")


2009/2/25 Laura Rodriguez Murillo <laura.lmurillo at gmail.com>:
> Hi dear list,
> If anybody could help me, it would be great!
> I have two files:
> File 1 is a list (one column and around 100000 rows)
> File 2 is a list with all the names from file one and a few more (one
> column and more than 100000 rows)
> What I want is to add a column in file 2 that says which name appeared
> in file 1 and which doesn't (yes and no would work as a code)
> It's very important to keep the order of the names in file 2.
> Thank you!
> Laura
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