how to apply a function to a specific set of variable from a dataframe in r

To apply a function to a specific set of variables from a dataframe in R, we can use the dplyr library which provides an easy way to manipulate data frames.

Let's say we have a data frame called df with columns col1, col2, col3, col4, and we want to apply a function my_function() to columns col2 and col4 only.

We can use the select() function from dplyr to select the columns we want, and then apply the function using the mutate() function. Here's an example code:

main.r
library(dplyr)

df %>%
  select(col2, col4) %>%
  mutate(result = my_function(col2, col4))
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In this code, we first select col2 and col4 using the select() function. Then, we use the mutate() function to create a new column called result which contains the result of applying my_function() to col2 and col4.

This will return a new data frame with the selected columns and the new result column containing the output of my_function() applied to these columns.