[R] Creating a new vector ( another problem)

[Gabor Grothendieck]

rollapply in zoo can do that.  coredata extracts the data portion from
the returned zoo object:

y <- 1:20 # test data

library(zoo)
coredata(rollapply(zoo(y), 5, sum, by = 5, na.pad = TRUE, align = "r"))


On 11/20/06, Amir Safari <amsa36060 at yahoo.com> wrote:
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>     Dear R Users,
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>  Suppose we are  interested for generating a new vector ( x ) from a current vector (y)  of length 1000 so that x includes the sum of every 5 values in y  respectively from the first to the end of length y. The same length of  y for x is desired, so that other 4 positions (indices) in x are filled  out with NA.
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>  For generating such a new vector, I have no idea. I tried in some ways  but all were wrong and therefore I do not want to confuse you.
>  How could such a purpose be coded?
>  Please help me with any idea. Thank you so much for help.
>  Amir Safari
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