Hi Erik and Jim.  Both solutions did the trick.  Thanks you!!
--Markus

On Tue, Sep 7, 2010 at 9:05 PM, jim holtman <jholtman@gmail.com> wrote:

> try this:
>
> > merged_data = merge(incidents, responses, by=c("INC_NO", "INC_YEAR"),
> all=TRUE)
> > # responses that don't match
> > subset(merged_data, is.na(INC_TYPE), select=c(INC_NO, INC_YEAR,
> UNIT_TYPE))
>    INC_NO INC_YEAR UNIT_TYPE
> 11      8     2018        E3
> 12      8     2018        E7
> 13      8     2018        T1
> > # incidents that don't match
> > subset(merged_data, is.na(UNIT_TYPE), select=c(INC_NO, INC_YEAR,
> INC_TYPE))
>    INC_NO INC_YEAR INC_TYPE
> 10      8     2008     FIRE
> >
>
>
> On Tue, Sep 7, 2010 at 8:25 PM, Markus Weisner <maw4b@me.com> wrote:
> > I am merging two dataframes using a relational key (incident number and
> > incident year), but not all the records match up.  I want to be able to
> > review only the records that cannot be merged for each individual
> dataframe
> > (essentially trying to select records from one dataframe using a
> multi-value
> > relational key from the other dataframe).  The following code shows what
> I
> > am trying to do.  The final two lines of code do not work, but if
> somebody
> > could figure out a workable solution, that would be great.  Thanks.
> > --Markus
> >
> > incidents = data.frame(
> >        INC_NO = c(1,2,3,4,5,6,7,8,9,10),
> >        INC_YEAR = c(2006, 2006, 2006, 2007, 2008, 2008, 2008, 2008, 2009,
> > 2010),
> >        INC_TYPE = c("EMS", "FIRE", "GAS", "MVA", "EMS", "EMS", "EMS",
> > "FIRE", "EMS", "EMS"))
> >
> > responses = data.frame(
> >        INC_NO = c(1,2,2,2,3,4,5,6,7,8,8,8,9,10),
> >        INC_YEAR = c(2006, 2006, 2006, 2006, 2006, 2007, 2008, 2008, 2008,
> > 2018, 2018, 2018, 2009, 2010),
> >        UNIT_TYPE = c("E2", "E2", "E5", "T1", "E7", "E6", "E2", "E2",
> "E1",
> > "E3", "E7", "T1", "E7", "E5"))
> >
> > merged_data = merge(incidents, responses, by=c("INC_NO", "INC_YEAR"))
> >
> > relational_key = c("INC_NO", "INC_YEAR")
> >
> > ## following does not work, but I want DF of incidents that did not merge
> up
> > with responses
> > incidents[incidents[,relational_key] %in% responses[,relational_key],]
> >
> > ## following does not work, but I want DF of responses that did not merge
> up
> > with incidents
> > responses[responses[,relational_key] %in% incidents[,relational_key],]
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?
>

	[[alternative HTML version deleted]]

