dataframe - R, create new column that consists of 1st column or if condition is met, a value from the 2nd/3rd column -

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                 b      c    d 1     boiler   maker   <na> <na>  2      clerk assistant <na> <na>  3     senior machine setter <na>  4   operated    <na>   <na> <na>  5 consultant    legal  <na> <na>

how create new column takes value in column 'a' unless of other columns contain either legal or assistant in case takes value?

here base-r solution. use apply , any test every column @ once.

df$col <- as.character(df$a) df$col[apply(df == "legal",1,any)] <- "legal" df$col[apply(df == "assistant",1,any)] <- "assistant"

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