Multiple unions

Question

I am trying to do unions on several lists (these are actually GRanges objects not integer lists but the priciple is the same), basically one big union.

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Answer 1

A not necessarily memory efficient paradigm that will work with GRanges is

Reduce(union, list(x, y, z))

The argument might also be a GRangesList(x, y, z) for appropriate values of x etc.