[R] pivoting - summing up factors

From: juanita choo <juanitachoo_at_gmail.com>
Date: Wed, 07 May 2008 13:56:00 -0500

I would like to know how to pivot a table that will sum the number of plants (a or b) for each location (x,y,z)
I have read on the listserve similar questions but which involve summing up numbers rather than factors. I have also read about the R package reshape on the listserve but wanted to know if there's a way to do it easily without the package
Thanks for the help!

location plant

 x             a
 x             b
 x             b
 y             b
 y             b
 y             a
 z             a
 z             a

into a table like this

       x            y           z
a     1            1           2
b     2            2           0

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