Dear All,
I am looking for a function to get lagged dates from an input vector of
dates, whereas the lag is specified by another vector. Each date is lagged
by a different number of days. (specified in vector n)
Example:
input <- as.Date( c( "2002-01-30", "2002-02-24",
"2002-03-31") )
n <- c(10, 20, 31)
Desired Result:
"2002-02-09"
"2002-03-16"
"2002-05-01"
Can anyone help me with this?
Thanks in advance,
RNoob
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Not the best way but it seems to work: do.call(c, lapply(1:length(n), function(i) input[i] + n[i])) Also, the lubridate < http://cran.r-project.org/web/packages/lubridate/index.html> package might be useful. HTH, Jorge.- On Wed, Feb 1, 2012 at 11:45 AM, RNoob <> wrote:> Dear All, > > I am looking for a function to get lagged dates from an input vector of > dates, whereas the lag is specified by another vector. Each date is lagged > by a different number of days. (specified in vector n) > > Example: > > input <- as.Date( c( "2002-01-30", "2002-02-24", "2002-03-31") ) > > n <- c(10, 20, 31) > > Desired Result: > > "2002-02-09" > "2002-03-16" > "2002-05-01" > > Can anyone help me with this? > > Thanks in advance, > > RNoob > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Lag-vector-of-dates-by-vector-of-days-tp4348530p4348530.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >[[alternative HTML version deleted]]
input + n Michael On Wed, Feb 1, 2012 at 11:45 AM, RNoob <ae at alpha-centauri.com> wrote:> Dear All, > > I am looking for a function to get lagged dates from an input vector of > dates, whereas the lag is specified by another vector. Each date is lagged > by a different number of days. (specified in vector n) > > Example: > > input <- ?as.Date( c( "2002-01-30", "2002-02-24", "2002-03-31") ) > > n ? ? ? ? <- ?c(10, 20, 31) > > Desired Result: > > "2002-02-09" > "2002-03-16" > "2002-05-01" > > Can anyone help me with this? > > Thanks in advance, > > RNoob > > > -- > View this message in context: http://r.789695.n4.nabble.com/Lag-vector-of-dates-by-vector-of-days-tp4348530p4348530.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.