[R] indexing question

[Bunny, lautloscrew.com]

Hi all,

i have a pretty easy indexing question, at least i believe so. The  
main reason i post it here, is that brackets and $ are hard to google.

How do I index correctly, if i just want to display the whole dataset  
conditioned on the fact that some particular column equals one.

I know i can do something like:   data$somecolumn[data$particularcol  
==1] . That will show all "some column" values where the particular  
column is 1.
Unfortunately something like : data[data$particularcol ==1] does not  
work to get the whole matrix.

is there some easy way except the % in % stuff ?

Thx in advance