[R] tabulation on dataframe question
Moshe Olshansky
m_olshansky at yahoo.com
Tue Feb 19 06:29:19 CET 2008
If d is your dataframe, how about
ind <- d$Dist == 2
aggregate(d,by=list(d$NameA,dNameA),FUN=length)
Regards,
Moshe.
--- Karin Lagesen <karin.lagesen at medisin.uio.no>
wrote:
>
> I have a data frame with data similar to this:
>
> NameA GrpA NameB GrpB Dist
> A Alpha B Alpha 0.2
> A Alpha C Beta 0.2
> A Alpha D Beta 0.4
> B Alpha C Beta 0.2
> B Alpha D Beta 0.1
> C Beta D Beta 0.3
>
> Dist is a distance measure between two entities. The
> table displays
> all to all distances, but the distance between two
> entities only
> appears once. What I would like to get is a table
> where I get a count
> of entities per group where the distance satisfies a
> certain condition
> ( equal to zero for instance).
>
> In this case, if the requirement was Distances ==
> 0.2
>
> Alpha Beta
> Alpha 1 2
> Beta 2 0
>
> This resulting table would be symmetrical.
>
> I hope I am able to convey what I would like, and
> TIA for your help!
>
> Karin
> --
> Karin Lagesen, PhD student
> karin.lagesen at medisin.uio.no
> http://folk.uio.no/karinlag
>
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