I have a GenomicRanges object built from interrogated sites and a RangedData
object of human (allegedly canonical) transcription start sites, from Julie
Zhu's ChIPpeakAnno package.  I want to walk up and down each chromosome and
find the nearest forward and reverse strand TSS and their distance from each
site.  This seems like it would work:

> nearest(cpgranges, TSS.human.GRCh37)

But one of the objects isn't the right type:

Error in function (classes, fdef, mtable)  :
  unable to find an inherited method for function "nearest", for signature
"GRanges", "RangedData"

What's the right way to solve this problem?  I know about follow() and
precede(), but those won't work either until I solve this :-)

thanks!



-- 
If people do not believe that mathematics is simple, it is only because they
do not realize how complicated life is.
John von Neumann<http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Von_Neumann.html>

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