strandName: Retrieve strand information from a ChrStrandMatrix object.
Description
This generic function simply returns the chromosome strand which name of all the chromosomes
represented by a given ChrStrandData object. Note that not every sample
associated with the object need have data from every chromosome.
Usage
strandName(object)
Arguments
object
Object derived from class ChrStrandMatrix
Value
strandName(object) returns the name of the strand from which
the object data is taken.