loop with dates
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Fernando Bizuet Sent: Friday, December 12, 2008 12:55 PM To: r-help at r-project.org Subject: [R] loop with dates Hello, I am trying to do a loop with dates, but when I try to use the index is not a date.
See ?"for". That help page mentions the following which can clarify what to expect "... The variable 'var' has the same type as 'seq' ..." Small illustration, fac <- gl(5,1,labels=letters[1:5]) fac [1] a b c d e Levels: a b c d e typeof(fac) [1] "integer" for(i in fac) print(i) [1] 1 [1] 2 [1] 3 [1] 4 [1] 5
Fcorte <- as.Date('2008/11/30',format = "%Y/%m/%d")
fini <- Fcorte + 1
ffin <- seq(fini,by='months',length=2)[2] - 1
for (i in seq(fini,to = ffin, by='days'))
print (weekdays(i)) # i doesn't a date
typeof(ffin)
[1] "double"
As your index is no longer of class 'Date', you will get
Error in UseMethod("weekdays") : no applicable method for "weekdays
How can I do a loop with dates and get the index of each date? are there a method to convert the index i to date?
Here's one way dd <- seq(fini,to = ffin, by='days') for (i in seq_along(dd)) print(dd[i])
Thanks in advance. [[alternative HTML version deleted]]
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