Hello,
I've just noticed that my first solution would only return the first set
of alphabetic characters, such as "Van", not "Van den Hoops".
The following will solve that problem.
fun2 <- function(x, sep = ", "){
x <- strsplit(x, sep)
m <- lapply(x, function(y) gregexpr(" [[:alpha:]]*$", y))
res <- lapply(seq_along(x), function(i)
regmatches(x[[i]], m[[i]], invert = TRUE))
res <- lapply(res, unlist)
lapply(res, function(y) y[nchar(y) > 0])
}
fun2(pub)
Hope this helps,
Rui Barradas
Em 23-01-2013 18:33, Rui Barradas escreveu:
Hello,
Try the following.
fun <- function(x, sep = ", "){
s <- unlist(strsplit(x, sep))
regmatches(s, regexpr("[[:alpha:]]*", s))
}
fun(pub)
Hope this helps,
Rui Barradas
Em 23-01-2013 17:38, Biau David escreveu:
Dear All,
I have a data frame of vectors of publication names such as 'pub':
pub1 <- c('Brown DK, Santos R, Rome DF, Don Juan X')
pub2 <- c('Benigni D')
pub3 <- c('Arstra SD, Van den Hoops DD, lamarque D')
pub <- rbind(pub1, pub2, pub3)
I would like to construct a dataframe with only author's last name and
each last name in columns and the publication in rows. Basically I
want to get rid of the initials (max 2, always before a comma) and
spaces surounding last name. I would like to avoid a loop.
ps: If I could have even a short explanation of the code that extract
the values of the character string that would also be great!
David
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
