[R] changing the day of the week in dates format

From: Dave Evens <daveevens1_at_yahoo.co.uk>
Date: Sat, 14 May 2011 19:44:40 +0100 (BST)

Dear all,

I have a question related to the POSIXlt function in R.

I have a set of dates and times, for exmaple:

startx <- as.POSIXct("2011-01-01 00:00:00") finx <- as.POSIXct("2011-12-31 00:00:00")

daysx<- seq(startx, finx, by="24 hours")

 want to change the dates of all the days falling on a Saturday to the next working day (i.e. Monday). So I convert dates to POSIXlt

mydaysx <- as.POSIXlt(daysx)

Then I change select all the Saturday's and move them on to Monday

select <- mydaysx$wday==6
mydaysx$mday[select] <- mydaysx$mday[select] + 2

 although all the new dates (i.e. mydaysx) are actual days of the year -  the $wday have not been updated and the $mdays have not all been corrected (i.e. those falling into the next month). So if I do

select <- mydaysx$wday==6

I still get the same set of days as before.

Is there a way to do this?


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