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trend
2010 Jun 09
0
Extract/format/show for S4 objects (Johann Hibschman)
...09") # months since the end of last year; date
input format also works for my location
[1] 3 6 9 12
attr(,"timeunits")
[1] "months"
> c((A-mondate("12/31/2009"))/3) # divide by 3 and remove the attribute and
you have quarters
[1] 1 2 3 4
> data.frame(QtrEnd=A, Amount=rep(1000,4))
QtrEnd Amount
1 03/31/2010 1000
2 06/30/2010 1000
3 09/30/2010 1000
4 12/31/2010 1000
If the date you are subtracting off is somewhere in the fourth quarter of
2009 but you still want to treat it as being representative of the fourth
quarter, the floor function...