CODEWITHSUNDEEP
rdataframemerge
Y. Z.
Y. Z.

Reputation: 377

Merging two columns of type factor

I want to combine two columns with different length in one column with unique factors, here is the example:

list1 <- as.factor(c('1a','2r','6t'))
list2 <- as.factor(c('1a','5p','3g','2341','7','2r'))

to

NewList
  1a      
  2341       
  2r        
  3g       
  5p       
  6t
  7

I have tried rbind and data.frame but they seem not working very well with columns in different length.

Upvotes: 3

Views: 136

Answers (2)

989
989

Reputation: 12935

Using union in base R:

data.frame(newlist=union(levels(list1), levels(list2)))

#  newlist
#1      1a
#2      2r
#3      6t
#4    2341
#5      3g
#6      5p
#7       7

Upvotes: 3

grigor
grigor

Reputation: 1624

How about as.factor(unique(c(as.character(list1), as.character(list2))))?

Upvotes: 2

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