Hello R users,

This is more of a convenience question that I hope others might find useful
if there is a better answer.  I work with large datasets that requires
multiple parsing stages for different analysis.  For example, compare group
3 vs. group 4.  A more complicated comparison would be time B in group 3 of
group L with B in group 4 of group L.  I normally subset each group with
the following type of code.

data=read(...)

#L v D
L=data[LvD %in% c("L"),]
D=data[LvD %in% c("D"),]

#Groups 3 and 4 within L and D
group3L=L[group %in% c("3"),]
group4L=L[group %in% c("3"),]

group3D=D[group %in% c("3"),]
group4D=D[group %in% c("3"),]

#Times B, S45, FR2, FR8
you get the idea


Is there a more efficient way to subset groups?  Thanks for any insight.

Regards,
Charles

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