use dplyr mutate to create new columns based on a vector of column names

Question

I would like to take the log of some columns, and create new columns that are all named log[original column name].

The code below works, but how can I pass the vecto

Answer 1

Ignoring the "use dplyr" part...

require(data.table)    

mtcars <- as.data.table(mtcars)

mtcars[, paste0('log', columnstolog) := lapply(.SD, log), .SDcols = columnstolog]