tidyr 0.8.0

API changes

There was a bug in separate() where negative values had an off-by-one error. Now -1 correctly refers to the first position between characters counting from the right hand side.

df <- tibble(x = c("male1", "female2", "male2"))
df %>% separate(x, c("gender", "number"), -1)
#> # A tibble: 3 x 2
#>   gender number
#>   <chr>  <chr> 
#> 1 male   1     
#> 2 female 2     
#> 3 male   2

New features

Thanks to the suggestion of Andrew Bray, tidyr can now “uncount” a data frame, duplicating aggregate rows:

df <- tibble(x = c("a", "b", "c"), n = c(2, 3, 1))
df %>% uncount(n)
#> # A tibble: 6 x 1
#>   x    
#>   <chr>
#> 1 a    
#> 2 a    
#> 3 b    
#> 4 b    
#> 5 b    
#> 6 c

If you want a unique identifier for each row, use the .id argument:

df %>% uncount(n, .id = "id")
#> # A tibble: 6 x 2
#>   x        id
#>   <chr> <int>
#> 1 a         1
#> 2 a         2
#> 3 b         1
#> 4 b         2
#> 5 b         3
#> 6 c         1

Acknowledgements

A big thanks goes out to all 90 users who contributed issues, pull requests, and comments since the last release: @aaronwolen, @adeldaoud, @amarchin, @AndreMikulec, @andrewhn, @andrewpbray, @antoine-sachet, @aosmith16, @Ax3man, @batpigandme, @bheavner, @billdenney, @burchill, @carlganz, @casras111, @cb4ds, @chris-park, @colearendt, @cpsievert, @cswarth, @cviner, @dscarlat, @echasnovski, @eibanez, @feuerbach, @flying-sheep, @GegznaV, @geotheory, @ggrothendieck, @gireeshkbogu, @gregmacfarlane, @hadley, @halpo, @holgerbrandl, @huftis, @Hydr0Ge0Dude, @instantkaffee, @jarodmeng, @jebyrnes, @jennybc, @jerryfuyu0104, @JerryWho, @jgellar, @JoFrhwld, @jstitlow, @junoslukan, @jzadra, @karldw, @kendonB, @krlmlr, @l-d-s, @leungi, @lorenzwalthert, @luke-a, @MarcusWalz, @markdly, @mattmills49, @maurolepore, @MaximeWack, @meow9th, @mgirlich, @mmuurr, @Monduiz, @naveennjs, @ngr-t, @njtierney, @npjc, @paulponcet, @petereckley, @pgensler, @pietermarsman, @PMassicotte, @ripkrizbi, @sfirke, @slygent, @stefvanbuuren, @t-kalinowski, @tbradley1013, @tcovert, @tentacles-from-outer-space, @thays42, @tiagowright, @tiernanmartin, @tshynik, @urskalbitzer, @voxnonecho, @wibeasley, @yutannihilation, @zelite, and @zhukunism.