r - How to combine two or more columns in a dataframe into a new column with a new name? -

for example if have this:

n = c(2, 3, 5)  s = c("aa", "bb", "cc")  b = c(true, false, true)  df = data.frame(n, s, b)    n  s     b 1 2 aa  true 2 3 bb false 3 5 cc  true

then how combine 2 columns n , s new column named x such looks this:

  n  s     b     x 1 2 aa  true  2 aa 2 3 bb false  3 bb 3 5 cc  true  5 cc

use paste.

 df$x <- paste(df$n,df$s)  df #   n  s     b    x # 1 2 aa  true 2 aa # 2 3 bb false 3 bb # 3 5 cc  true 5 cc

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