r - Create new variable -


i have data.frame contains 713 rows , 1 of it's columns itemcode has 228 unique codes. question is, how create choice selection ids?

nrow(test.1) [1] 713  length(unique(test.1$itemcode)) [1] 228  head(test.1)        itemcode id 2    1180158001  1 225  1180149701  2 264  1180074301  3 522  1180177701  4 732  1180197201  5 1182 1170015601  6

here trial code:

test$id <- 1:nrow(test) (i in unique(test$itemcode))      (j in 1:length(unique(test$itemcode)))          test$choice[test$itemcode == i] <- j

my desired output this

      itemcode  id choice   2    1180158001  1 1    225  1180149701  2 2   264  1180074301  3 3    522  1180177701  4 4    732  1180197201  5 5    1182 1170015601  6 6    523  1180177701  7 4

this works. if test.1 subset of test? code return underlaying values test.

test$choice <- as.integer( as.factor( test$itemcode ) )

i think want factor...

test$choice <- as.integer( as.factor( test$itemcode ) )

this turn each unique itemcodeinto integer coded variable. as.integer show underlying values are. if want them ordered appear in data.frame need specify levels of factor variable , can using factor rather as.factor. 

#  turn them integer code - ordering sorted on value of itemcode test$choice <- as.integer( as.factor( test$itemcode ) )  # same, specify ordering values appear in dataframe test$choice2 <- as.integer( factor( test$itemcode , levels = test$itemcode[ ! duplicated( test$itemcode ) ] ) )         itemcode id choice choice2 2    1180158001  1      4       1 225  1180149701  2      3       2 264  1180074301  3      2       3 522  1180177701  4      5       4 732  1180197201  5      6       5 1182 1170015601  6      1       6 523  1180177701  7      5       4

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