Summary: opposite of merge

["Lambert.Winnie" <lambert.winnie@ensco.com>]

All,

 

Thanks to Sean Keenan, Tim Hesterberg, Tom Jagger, Julia Reid, Manoel Pacheco, Jean Adams, and Tony Plate for your quick responses.  There are a lot more details to my data frames than I put in the email that were apparently important.  I tried all suggestions and the one that worked without much modification was from Julia:

 

df4 <- df2[!is.element(paste(df2$Year, df2$Month, df2$Day), paste(df3$Year, df3$Month, df3$Day)), ]

 

for some reason I could not use !is.element, kept getting a wierd error.  So I went in the back door by using

 

good <- is.element(...)

df4 <- df2[!good,]

 

Perhaps I was just hitting a wrong key when I tried !is.element.....

 

Anyway, thanks to all.  This is a great group.  Not sure I would have come up with this solution on my own very quickly, if at all!

 

Win

 

 

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Winifred C. Lambert  Senior Scientist/Meteorologist

ENSCO, Inc.

Aerospace Sciences and Engineering Division

1980 N. Atlantic Ave., Suite 230

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VOICE:  321.853.8130  FAX:  321.853.8415

EMAIL:  lambert.winnie@ensco.com

 

AMU Quarterly Reports are available online:

http://science.ksc.nasa.gov/amu

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