[R] Command to combine means?

[Carlos R. Moreira Maia]

Dear all,
I'm newbie with R (changing from STATA), and I can't find some commands.
One of those is the "combine", which I use to combine means like this:

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n1 m1 sd1  n2 m2 sd2

combine 12 3 1 34 45 4

Combine has calculated the following values:
    combined n = 46
    combined mean = 34.043478
    combined SD = 18.964829
--------------------------------------------

Does anybody knows a simmilar command in R to combine means?

Thanks in advance.

Carlos.

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