GRangesList asserts that all GRanges have the same set of metadata columns
(mcols). GenomicRangesList, which does not have that constraint, is the
appropriate container in this case.

Michael


On Wed, Feb 26, 2014 at 12:50 AM, Kalyan K Pasumarthy
<kalyankpy@gmail.com>wrote:

> Hi,
>
> I am trying to create a GRanges list object for all the features of a
> transcript database created from the GENCODE gtf file. I have created
> GRanges object for the features "exons","genes","transcripts","introns".
> When I try to combine these individual objects into a GRangesList, I get
> the following error:
>
> >grl<-GRangesList("genes"=genes.gencode,"transcripts"=transcript.gencode)
> Error in .Method(..., deparse.level = deparse.level) :
>   number of columns for arg 2 do not match those of first arg
>
> Detailed steps I have used in creating the transcriptDb object and
> extraction of features is identical to the procedure followed in this blog
> post
> <
> http://chitka-kalyan.blogspot.com/2014/02/creating-gencode-transcript-database-in.html
> >
>
> I would appreciate if somebody could help me solve this!
>
> Regards,
> Kalyan
>
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