[R] Manipulating matrices

From: SÚrgio Nunes <snunes_at_gmail.com>
Date: Wed 14 Dec 2005 - 05:42:21 EST


I'm pretty new to R and I've been having some problems filtering data in matrices.

I have the following initial dataset:

|| year | name | varA ||

I have multiple values for "varA" for the same "year" and the same "name". Having this as the input I would like to obtain the following:

|| year | name | {varA mean} ||

Where I only have one line for each "year" and "name" with the mean of the values of "varA" in "varA mean".

Is there a simple way to achieve this without using control structures (for or while cycles)?

Thanks in advance for any help.

Best regards,
SÚrgio Nunes

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