r - How can I attach new levels with specific values for specific rows -

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i have dataframe column name of individuals , columns results. want attach new column either 1 , 2 or na depending on individual.

i have vector individuals level 1 , 1 individuals level 2

how can attach collumn data frame goes this: if dataframe$individual (1,3,6,7) value in column 1, if dataframe$individual (2,5,8) value in column 2, else value na

i hope made clear example looking for. help

try

dat$newcol <- with(dat, ifelse(individual %in% c(1,3,6,7), 1,                       ifelse(individual %in% c(2,5,8), 2, na)))

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