[R] replace non numeric with "NA"

From: Nandini B <nandini_bn_at_hotmail.com>
Date: Fri, 29 Apr 2011 16:15:22 +0530

 Hello,
I have a sample data frame which looks like this

  day      od       month
1   1     0.1            2
2   3 #VALUE!     1
3   5     0.4             12
4   7     0.8             10
5  11       -              3
6  14       s             7
7  18      --             12
8  27      19            7


Now i wish to filter all the non numeric values and replace it with "NA". The data frame is actually huge and the non numeric characters vary from "-" to a string to absolutely anything!!! Can anyone please help ?

Thank you,
Warm Regards,

Nandini                                                

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