Merge Dataframes to Fill Missing Data in RStudio

General
5

Now that I have a little time I can give you a reproducible example (reprex)

library(dplyr)

# Sample data in a copy/paste friendly format, replace these with your own data frames 
df1 <- data.frame(
  stringsAsFactors = FALSE,
                 x = c("A1", "A2", "A3"),
                 y = c("blue", NA, "yellow")
)

df2 <- data.frame(
  stringsAsFactors = FALSE,
                 x = c("A1", "A2", "A3"),
                 y = c(NA, "red", NA)
)

# Relevant code
df1 %>%
    rows_update(df2 %>% filter(!is.na(y)), by = "x")
#>    x      y
#> 1 A1   blue
#> 2 A2    red
#> 3 A3 yellow

Note: Next time please provide a proper REPRoducible EXample (reprex) illustrating your issue.