CODEWITHSUNDEEP
rdataframe
iiaawaak
iiaawaak

Reputation: 27

R delete value from column if it does not contain itself in value from another column

I have a dataframe in R that looks like this:

genus species
Vulgatibacter Vulgatibacter sp.
NA Planctomyces
Holophaga Geothrix sp.

And I want to delete values from column species if the value from genus does not contain in species. I want to have this:

genus species
Vulgatibacter Vulgatibacter sp.
NA Planctomyces
Holophaga NA

transform(.,Species= ifelse(Genus %in% Species, Species, NA)) does not work.

Upvotes: 0

Views: 58

Answers (1)

Stefano Barbi
Stefano Barbi

Reputation: 3194

df |>
  mutate(species = case_when(mapply(grepl, sprintf("^%s", genus), species) ~ species,
                             is.na(genus) ~ species,
                             TRUE ~ NA_character_))

#> # A tibble: 3 × 2
#>   genus         species          
#>   <chr>         <chr>            
#> 1 Vulgatibacter Vulgatibacter sp.
#> 2 NA            Planctomyces     
#> 3 Holophaga     NA

Upvotes: 1

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