r - create a list from duplicated data in columns in the same dataframe in RStudio -


i have several columns in same data frame lists location names, column headings differ slightly

  1. location 1 (adelaide, sydney, perth)
  2. location 2 (perth, darwin, adelaide)
  3. location 3 (brisbane, adelaide, melbourne)

i want 1 location column combines 3 of these columns keeps unique location names.

for example, final column list - location (adelaide, sydney, perth, darwin, brisbane, melbourne)

if in dataframe thei gives reduced factor result, 

> unique(unlist(dat)) [1] adelaide  sydney    perth     darwin    brisbane  melbourne levels: adelaide perth sydney darwin brisbane melbourne

which if wanted dataframe simple enough:

newdat <- data.frame(location1 = unique(unlist(dat)) ) > newdat   location1 1  adelaide 2    sydney 3     perth 4    darwin 5  brisbane 6 melbourne

and as.character turn character vector.

test object:

dat <- data.frame(      location1 = c('adelaide', 'sydney', 'perth'),      location2= c('perth', 'darwin', 'adelaide'),      location3 =c('brisbane', 'adelaide', 'melbourne'))

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