how to rename a first column in r code example

Example 1: R rename singl edf column

colnames(trSamp)[2] <- "newname2"

Example 2: r rename columns

library(plyr)
rename(d, c("beta"="two", "gamma"="three"))
#>   alpha two three
#> 1     1   4     7
#> 2     2   5     8
#> 3     3   6     9