move all ranges in a GRanges to randomly chosen chromosomes with new starting positions
reposition(gr, backoff = -20000)
an integer in bases to move a range whose end hangs over end of chromosome
Purpose is to obtain a set of ranges with widths identical
gr, but randomly relocated over the genome
It would be nice to be able to reposition to locations that are remote but that share certain characteristics like GC proportion ...
Currently if a chromosome is not represented in
it is not a candidate for hosting a repositioned range.
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