Trying to make a new dataframe using Dplyr

dplyrstuff.R

### Trying to create new dataframes from dplyr 0.4.3 functions using R 3.2.2.


#Very Simple Example:
paste("cars_with", 6, "cylinders", sep = "_") <- filter(mtcars, cyl == 6)

#What I want there is a dataframe named "cars_with_6_cylinders" that has the results of this:
filter(mtcars, cyl == 6)

#But instead, what I get is this:
"Error in paste("cars_with", 6, "cylinders", sep = " ") <- filter(mtcars,  : 
  target of assignment expands to non-language object"

#Ultimately, what I'd like is something more complex like:
paste("cars_with", 6, "cylinders", sep = "_") <- filter(mtcars, cyl == 6) %>%
  group_by(gear) %>% 
    summarise(number_of_cars = n()))

#And wrap that up in a function like this:

gearframes <- function(x){
  paste("cars_with", x, "cylinders", sep = "_") <- filter(mtcars, cyl == x) %>%
  group_by(gear) %>% 
    summarise(number_of_cars = n()))
}

#Then I could feed the function something like:
sapply(mtcars$cyl, gearframes)

#And get dataframes for each numer of cylinders in mtcars$cyl.

Did you ever figure this out? I am getting the same error when I resample my data with group_by() %>% sample_n() %>% bind_rows.