select rows with unidentical column values using R

Posted by Bazon on Stack Overflow See other posts from Stack Overflow or by Bazon
Published on 2010-05-20T01:08:00Z Indexed on 2010/05/20 2:30 UTC
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Hi Guys, I need to create a new data frame that excludes dams that appear in "dam1" and "dam2" columns on the same fosdate (fostering date). I tried df <- df[df$dam1!=df$dam2,] but did not work. Dam1 and dam2 are factors which are the ids's of mothers.

my df:

fosdate      dam1     dam2
8/09/2009    2Z523    2Z523
30/10/2009   1W509    5C080
30/10/2009   1W509    5C640
30/10/2009   1W509    1W509
1/10/2009    1W311    63927

The new data frame that I need to get is: dfnew:

fosdate      dam1     dam2
30/10/2009   1W509    5C080
30/10/2009   1W509    5C640
1/10/2009    1W311    63927

Would appreciate any help!

Bazon

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