How can R loop over data frames?

Question

Suppose there are many data frames that need the same operation performed on them. For example:

prefix <- c(\"Mrs.\",\"Mrs.\",\"Mr\",\"Dr.\",\"Mrs.\",\"M         


        

Answer 1

Put all your data frames into a list, and then loop/lapply over them. It'll be much easier on you in the long run.

dfList <- list(df1=df1, df2=df2, ....)

dfList <- lapply(dfList, function(df) {
    df$gender[df$prefix == "Mrs."] <- "F"
    df
})

dfList$df1