[R] Summation resulting in a list?

[mousy0815]

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

HTH,
Daniel



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
function?
(Sorry! I'm kind of newbie at this -_-;)

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