Hello
I have an IRanges object ir1:
ir1 <- IRanges(c(100,500), c(200,600))
> ir1
IRanges of length 2
    start end width
[1]   100 200   101
[2]   500 600   101

can you please show me how to use flank() to create a second IRanges object ir2 
with coordinates that are 50 upstream of ir1 'start' and 20 downstream of the 
same ir1 'start'? 

ir2 should look like this: 
    start end width
[1]    50  120    71
[2]    450 520    71

Thanks 
joseph



      
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