Filling up missing values

[Slavek]

Hi, I have this simple data frame:

source <- data.frame(
  stringsAsFactors = FALSE,
               URN = c("aa", "bb", "cc", "dd", "ee"),
             Model = c("aaa", "bbb", "ccc", "ddd", "eee"),
        FamilyName = c(NA, "bbbb", NA, "dddd", "eeee")
)

Is it possible to copy values from 'Model' to 'FamilyName' if 'FamilyName' is blank?

[nirgrahamuk]

Use ifelse and is.na() for the test

[andresrcs]

You can also use coalesce()

library(dplyr)

source <- data.frame(
    stringsAsFactors = FALSE,
    URN = c("aa", "bb", "cc", "dd", "ee"),
    Model = c("aaa", "bbb", "ccc", "ddd", "eee"),
    FamilyName = c(NA, "bbbb", NA, "dddd", "eeee")
)

source %>% 
    mutate(FamilyName = coalesce(FamilyName, Model))
#>   URN Model FamilyName
#> 1  aa   aaa        aaa
#> 2  bb   bbb       bbbb
#> 3  cc   ccc        ccc
#> 4  dd   ddd       dddd
#> 5  ee   eee       eeee

^{Created on 2022-07-06 by the reprex package (v2.0.1)}