How to find Previous Sunday in R

Question

It seems the Internet has not answered this question for R yet:

If I have a date. Say the 20th of march: as.Date(\"2015-03-20\") how do I get, in R, the previous Sun

Answer 1

Here is one approach:

d <-  as.Date("2015-03-18")
prev.days <- seq(d-6,d,by='day')
prev.days[weekdays(prev.days)=='Sunday']
# [1] "2015-03-15"