I'm puzzled as to why I get this behaviour with str_split_fixed in the stringr package.> stringr::str_split_fixed('ab','',2)[,1] [,2] [1,] "" "ab"> stringr::str_split_fixed('ab','',3)[,1] [,2] [,3] [1,] "" "a" "b" In the first example, I was expecting to get [,1] [,2] [1,] "a" "b" Can someone explain? Thanks, David
Dear David,
str_split_fixed calls str_locate_all, which gives
str_locate_all("ab", "")
## [[1]]
## start end
## [1,] 1 0
## [2,] 2 1
##
in your example, since "" is a character of length 1. substring() is
probably more intuitive to get your expected result:
substring("ab", 1:2, 1:2)
## [1] "a" "b"
David Barron <dnbarron at gmail.com> schrieb am Wed, 14. Jan
18:47:>I'm puzzled as to why I get this behaviour with str_split_fixed in the
>stringr package.
>
>> stringr::str_split_fixed('ab','',2)
> [,1] [,2]
>[1,] "" "ab"
>
>> stringr::str_split_fixed('ab','',3)
> [,1] [,2] [,3]
>[1,] "" "a" "b"
>
>In the first example, I was expecting to get
> [,1] [,2]
>[1,] "a" "b"
>
>Can someone explain?
>
>Thanks,
>David
>
>______________________________________________
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FWIW this is fixed in the dev version of stringr which uses stringi under the hood:> stringr::str_split_fixed('ab','',2)[,1] [,2] [1,] "a" "b"> stringr::str_split_fixed('ab','',3)[,1] [,2] [,3] [1,] "a" "b" "" Hadley On Wed, Jan 14, 2015 at 12:47 PM, David Barron <dnbarron at gmail.com> wrote:> I'm puzzled as to why I get this behaviour with str_split_fixed in the > stringr package. > >> stringr::str_split_fixed('ab','',2) > [,1] [,2] > [1,] "" "ab" > >> stringr::str_split_fixed('ab','',3) > [,1] [,2] [,3] > [1,] "" "a" "b" > > In the first example, I was expecting to get > [,1] [,2] > [1,] "a" "b" > > Can someone explain? > > Thanks, > David > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.-- http://had.co.nz/