List distinct values in a vector in R

Question

How can I list the distinct values in a vector where the values are replicative  I mean  similarly to the following SQL statement   SELECT DISTINCT product code FROM data

User · Accepted Answer

Do you mean unique   R gt  x   c 1 1 2 3 4 4 4  R gt  x  1  1 1 2 3 4 4 4 R gt  unique x   1  1 2 3 4

User · Answer

If the data is actually a factor then you can use the levels   function  e g   levels  data product code     If it s not a factor  but it should be  you can convert it to factor first by using the factor   function  e g   levels  factor  data product code       Another option  as mentioned above  is the unique   function   unique  data product code     The main difference between the two  when applied to a factor  is that levels will return a character vector in the order of levels  including any levels that are coded but do not occur  unique will return a factor in the order the values first appear  with any non-occurring levels omitted  though still included in levels of the returned factor

User · Answer

You can also use the sqldf package in R    Z  lt - sqldf  SELECT DISTINCT tablename columnname FROM tablename

User · Answer

another way would be to use dplyr package  x   c 1 1 2 3 4 4 4  dplyr  distinct as data frame x

User · Answer

Try using the duplicated function in combination with the negation operator       Example    wdups  lt - rep 1 5 5  wodups  lt - wdups which  duplicated wdups      Hope that helps

User · Answer

In R Language  version 3 0   You can apply filter to get unique out of a list- data list  lt - data list   gt   unique or couple it with other operation as well data list rollnumbers  lt - data list   gt   pull RollNumber    gt   unique unique doesn t require dplyr

[r] List distinct values in a vector in R

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