[R] extracting a sub data frame by value of one of its columns

[Faheem Mitha]

Dear R people,

This should be a straightforward operation, but I am having difficulties.
I have a data frame with three columns, call them a, b, and c. c is a
column of factors, 1...10. I want to extract all the rows for which c has
the value say 1, and put them in a separate data frame. I looked at the
various sort functions provided, but see no way to easily adapt them to my
needs.
                                   Sincerely, Faheem Mitha.

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