[R] boxplots of various levels

[dysonsphere]

noob here
trying to make boxplots of some data
i would like to separate the boxplots according to conditons of various
levels
for example:

i have 
group:1 and 2, each group performed tests consisting of
condition A,B,C,D
side: left and right
time: 1 to 10

I would like separate boxplots of the results (x) of the tests (numeric) for
each group under each condition on each side over time.

so far i have set it up like this:
boxplot(test$x~test$time)
this gives me the plot for all vaues of x in each time bin.  basicaly i
would need a command that tells R to include only the data that agrees with
the group, condition, and side I set.
something like 
boxplot(test$x~test$time) where test$group=1,test$condition=A,test$side=left

can this be done?




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