r - Data.frame copy and paste values based on a condition -


i have data frame following structure/values , go through data frame (by row) , paste values first column ("one") cells of other columns if not na:

my data: 

  1         2    3  4 1 bar_2_foo    na    na     1 2 mur_4_doo     1    na     2 3 bur_3_hoo    na     1    na

what achieve:

  1         2    3  4 1 bar_2_foo    na    na     bar_2_foo_1 2 mur_4_doo    mur_4_doo_1    na     mur_4_doo_2 3 bur_3_hoo    na     bur_3_hoo_1    na

any ideas how achieve great. thanks.

is you're looking for?

mutate_at(data, two:four, function(i){   ifelse(!is.na(i), paste0(one, "_", i), i) } )

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