[BioC] Turning a GRanges Metadata Column into Rle List

[Martin Morgan]

On 01/14/2013 10:00 PM, Dario Strbenac wrote:
>> I was thinking you could just do (assuming score is always >= 0, and that
>> the ranges do not overlap, which seems to be the case from the initial
>> code):
>
> In another scenario, what if I have data on multiple cell lines, such as one
> of the ENCODE integrated tracks, and I would like to find the maximum value
> at each base within a specified genomic region ? In this case, the ranges in
> the supertrack would overlap often.
>
> I would imagine making a separate coverage RleList for each cell line, to
> avoid complications with overlapping ranges. Then, it would be nice to have a
> pmax function in the API that could take a number of RleList objects, each of
> the same length, and return one RleList. Are there any plans for pmin and
> pmax of this style ?

I think there is one?

   library(IRanges)
   showMethods(class="RleList", where=search())

 > r1 = RleList(a=Rle(c(0, 0, 1, 0)), b=Rle(c(1, 1, 0, 0)))
 > r2 = RleList(a=Rle(c(0, 0, 2, 2)), b=Rle(c(1, 2, 1, 1)))
 > pmax(r1, r2)
SimpleRleList of length 2
$a
numeric-Rle of length 4 with 2 runs
   Lengths: 2 2
   Values : 0 2

$b
numeric-Rle of length 4 with 3 runs
   Lengths: 1 1 2
   Values : 1 2 1


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