[R] how to merge 2 data frame if you want to exclude mutual obs

[ramoss]

To clarify:

So if in data frame A you have

Tdate            symbol        TA
12/12/12      AX               123
12/11/12      ZZ                A4R
12/12/12      WQ              B8R

Data frame B
Tdate            symbol        TA
12/12/12      AX               123
12/11/12      ZZ                A4R

I want to end up w/
Tdate            symbol        TA
12/12/12      WQ              B8R

All obs not in B




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