[R] tabulation on dataframe question

[Moshe Olshansky]

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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