[R] selecting data from a data.frame?

[Michael A. Miller]

I know how to plot a subset of a data.frame by doing something
like 

 > plot( mydata$x[y>2] )

Is there a way to do something similar for an entire data.frame?
For example, I can do this something like

 > lm( x[y>2] ~ type[y>2], data=mydata )

but I'm a lazy typist, so I'd like to be able to do something
like 

 > lm( x ~ type, data=mydata[y>2] )

Is there a way to select rows from a data frame like that?

Mike
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