[R] how to add two data.frame with the same column but different row numbers

From: zhenjiang xu <zhenjiang.xu_at_gmail.com>
Date: Fri, 15 Apr 2011 16:31:16 -0400


Hi all,

Suppose I have 2 data.frame , a and b, how can I add them together to get c? Thanks
> a

  A
a 1
b 2
c 3

> b

  A
a 6
c 1

> c

   A
a 7
b 2
c 4

-- 
Best,
Zhenjiang

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