[R] Subscripting

[Greg Snow]

Something like:

> df3 <- df2[ !(df2$date %in% df1$date), ]

Might be what you want.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of GL
> Sent: Wednesday, February 10, 2010 12:26 PM
> To: r-help at r-project.org
> Subject: [R] Subscripting
> 
> 
> Dataframe1 contains a list of specific dates. Dataframe2 contains a
> large
> dataset, one element of which is Date. How do I create a subset of
> Dataframe2 that excludes the dates from Dataframe1? I know how to do it
> with
> a left outer join vs null in SQL, but I can't figure out how to do it
> more
> directly via the subcripts that already exist?
> 
> Dateframe1
> 
> Date
> 1/1/2010
> 1/18/2010
> 
> 
> Dataframe2
> 
> Date Attribute Count
> 1/1/2010 Red 5
> 1/15/2010 Green 2
> 1/18/2010 Purple 8
> 1/19/2010 Yellow 3
> 
> ResultingDataframe (Dataframe2 minus the rows that have Dates in
> Dataframe1)
> 
> Date Attribute Count
> 1/15/2010 Green 2
> 1/19/2010 Yellow 3
> 
> --
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> 
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