Concatenate string to data frame column

Question

I want to append to a data.frame the same string.

> df1 <- data.frame(pt1="a", pt2="b", row.names=1)
> df1
  pt1 pt2
1   a   b

As a result I would like to have:

   pt1                 pt2
1  Add this string a   Add this string b

akrun · Accepted Answer · 2015-12-29 15:43:31Z

7

We can use lapply

df1[] <- lapply(df1, function(x) paste('Add this string', x))

Or use Map

df1[] <- Map(paste, 'Add this string', df1)

Or

library(dplyr)
df1 %>%
     mutate_each(funs(paste('Add this string', .)))

answered Dec 29, 2015 at 15:43

akrun

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