hi,
to turn year and week into the date one can do the following:
as.Date('2018 05 Sun', "%Y %W %a")
however, when we want the Sunday (1st day of week) of the 1st week of 2018
we get NA because 1/1/2018 was on Monday
as.Date('2018 00 Mon',format="%Y %U %a")
## 2018-01-01
as.Date('2018 00 Sun',format="%Y %U %a")
## NA
btw the same goes for last week
as.Date('2017 53 Sun',format="%Y %U %a")
## 2017-12-31
as.Date('2017 53 Mon',format="%Y %U %a")
## NA
So my question is :
how do i get
from "2018 00 Sun" to 2018-12-31
and
from "2017 53 Mon" to 2018-01-01
i realize i can loop over days of week and do some if/then statements,
but is there a built in function?
thank you
peter
--
Peter Salzman, PhD
Department of Biostatistics and Computational Biology
University of Rochester
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