r - No applicable method for 'anti_join' applied to an object of class "factor" -


i want identify rows present in dataframe1 not present in dataframe2 based on particular column. have used below code desired information.

diffid <- anti_join(dat$id,datwe$id)

unfortunately, have encountered error:

error in usemethod("anti_join") :
no applicable method 'anti_join' applied object of class "factor"

i have checked class of desired column in both dataframes , turned out factor. have tried separate column separate variable in assumption might solve issue, of no luck !

fac1 <- datwe$id fac2 <- dat$id diffid <- anti_join(fac2,fac1)

could please share thoughts ?

thanks

almost dplyr functions operate on tbls (depending on context can data.frame, data.table, database connection , on) want this:

> dat <- data.frame(id=c(1, 3, 6, 4), x=runif(4)) > datwe <- data.frame(id=c(3, 5, 8), y=runif(3)) > anti_join(dat, datwe, by='id') %>% select(id)   id 1  4 2  6 3  1

note ordering not preserved.

if use factors (unlike numerics in example above) different levels there conversion between factor , character involved.

if want operate on vectors can use setdiff (available in both base , dplyr)

> setdiff(dat$id, datwe$id) [1] 1 6 4

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