r - Subset is not working -

i have dataset called "x" produces following records when head(x, 1)

 vrtg_id_nr eeg_vrtg_cat_v gebr_ident_keur pl_keuring naam_vrtg_aanb dat_result_keur tyd_result_keur kl_code_eu_1 kl_code_eu_2  1 vf1ja04n522215749             m1            null       null           null        20090527             906            6         null  res_code_keur kent_land_oors land_herk year   1           gdk      me-qt 761         d 2009 

i following when show classes of relevant column

$year [1] "numeric"

i want create subset see data years 2009 en 2010. tried

 x_subset <- x[x$year >=2009 & <= 2011] 

that gives me following error:

data frame 0 columns , 992287 rows 

while want overview subset of records between 2009 , 2011...

if year factor variable, first convert numeric:

x$year <- as.numeric(x$year) 

i think missing comma:

x_subset <- x[x$year >=2009 & x$year <= 2011,]