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tidyr::separate should prevent duplicated column names #255
Description
Example:
iris %>% separate(Species, c("Petal.Length"), remove=F)
Observations: 150
Variables: 6
$ Sepal.Length <dbl> 5.1, 4.9, 4.7, 4.6, 5.0, 5.4, 4.6, 5.0, 4.4, 4.9, 5.4,...
$ Sepal.Width <dbl> 3.5, 3.0, 3.2, 3.1, 3.6, 3.9, 3.4, 3.4, 2.9, 3.1, 3.7,...
$ Petal.Length <dbl> 1.4, 1.4, 1.3, 1.5, 1.4, 1.7, 1.4, 1.5, 1.4, 1.5, 1.5,...
$ Petal.Width <dbl> 0.2, 0.2, 0.2, 0.2, 0.2, 0.4, 0.3, 0.2, 0.2, 0.1, 0.2,...
$ Species <fctr> setosa, setosa, setosa, setosa, setosa, setosa, setos...
$ Petal.Length <chr> "setosa", "setosa", "setosa", "setosa", "setosa", "set...
The example does not really separate anything, but just illustrates the problem of tidyr creating ansemantically invalid data-frame with a duplicated column name.
tidyr::separate should throw an error in such a case. Or at least overwrite the existing column while printing a warning.
> sessionInfo()
R version 3.3.1 (2016-06-21)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.10.5 (Yosemite)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] dplyr_0.5.0 purrr_0.2.2 readr_1.0.0 tidyr_0.6.0
[5] tibble_1.2 ggplot2_2.1.0 tidyverse_1.0.0
loaded via a namespace (and not attached):
[1] Rcpp_0.12.7 assertthat_0.1 R6_2.1.3 grid_3.3.1
[5] plyr_1.8.4 gtable_0.2.0 DBI_0.5-1 magrittr_1.5
[9] scales_0.4.0 stringi_1.1.1 tools_3.3.1 munsell_0.4.3
[13] colorspace_1.2-6
Activity
pkopps commentedon Oct 25, 2016
Having same issue with
gather(), not sure if I could be something differently