Keep classes set on an object after filtering

[torbjorn]

filtering something drops any existing classes and adds just data.frame it seems.

    library(dplyr)
    d <- cars
    class( d ) <- c( "cars", "data.frame" )
    print.cars <- function( x, ... ) { print.data.frame( head( d, n=2 ) ); cat("...\n") }
    d
    class( d )
    class( d %>% filter( speed < 10 ) )
    d %>% filter( speed < 10 )

would be nice if my object kept its classes after filtering

print(d) # produces:

    > d
      speed dist
    1     4    2
    2     4   10
    ...

print(d %>% filter( speed < 10 )) # produces:

    > d %>% filter( speed < 10 )
      speed dist
    1     4    2
    2     4   10
    3     7    4
    4     7   22
    5     8   16
    6     9   10

[hadley]

Duplicate of #2432

[lock]

This old issue has been automatically locked. If you believe you have found a related problem, please file a new issue (with reprex) and link to this issue. https://reprex.tidyverse.org/