[R] Summation resulting in a list?

mousy0815 mousy0815 at gmail.com
Mon Jul 11 21:49:43 CEST 2011

Use the tapply() function as in tapply(b,m,sum)


Don't "b" and "m" have to be the same length then? What if they're not? And
would I just put the tapply() instead of everything else in my summing
(Sorry! I'm kind of newbie at this -_-;)

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