replace numbers of one dataset across rows with characters that match the numbers of another dataframe by column in r in r

You can achieve this in R by using the match() function or by using the dplyr and left_join() functions. Here's an example of how you can do it:

Let's assume you have two dataframes, df1 and df2, where df1 is the dataframe you want to replace numbers in, and df2 is the dataframe that contains the numbers and their corresponding characters.

main.r
# Create sample dataframes
df1 <- data.frame(
  id = c(1, 2, 3, 4, 5),
  value = c(10, 20, 30, 10, 20)
)

df2 <- data.frame(
  number = c(10, 20, 30),
  character = c('A', 'B', 'C')
)

# Using match() function
df1$character <- df2$character[match(df1$value, df2$number)]

# Using dplyr and left_join() functions
library(dplyr)
df1 <- left_join(df1, df2, by = c("value" = "number")) %>%
  select(-number)

print(df1)
416 chars
21 lines

This will replace the numbers in the value column of df1 with the corresponding characters from the character column of df2.

If you want to replace numbers across all rows (i.e., not just in a specific column), you can use the apply() function to apply the replacement operation to each row.

main.r
# Using apply() function
df1[] <- lapply(df1, function(x) df2$character[match(x, df2$number)])
95 chars
3 lines