Per the help page rollapply needs to be given a zoo or ts object, so
you just coerce the matrix to zoo:
> data_m <- matrix(1:20, ncol=2)
> data_q <-matrix(,nrow=7,ncol=2)
# then you can vectorize the process
> data_q[,] <-rollapply(as.zoo(data_m[,]),4,FUN=sum)
> data_q
[,1] [,2]
[1,] 10 50
[2,] 14 54
[3,] 18 58
[4,] 22 62
[5,] 26 66
[6,] 30 70
[7,] 34 74
--
David Winsemius
On Mar 1, 2009, at 10:16 PM, Mohammad Sabr wrote:
Thanks Jorge,
I tried to use the rollapply function as follows:
rollapply(data_m ,4 , sum, by =1 , by.column = TRUE)
but it is giving me the following error message:
Error in UseMethod("rollapply") : no applicable method for "rollapply"
Is there any file that I need to install or update. I reinstalled
the zoo package but I still getting the previous problem.
Thank you for your assistance,
--- On Sun, 3/1/09, Jorge Ivan Velez <jorgeivanve...@gmail.com> wrote:
From: Jorge Ivan Velez <jorgeivanve...@gmail.com>
Subject: Re: [R] Partial sum of a vector
To: "Mohammad Sabr" <mohammad_s...@yahoo.com>
Cc: r-help@r-project.org
Date: Sunday, March 1, 2009, 10:49 PM
Dear Mohammad,
Take a look at the rollmean function in the zoo package.
HTH,
Jorge
On Sun, Mar 1, 2009 at 9:29 PM, Mohammad Sabr
<mohammad_s...@yahoo.com> wrote:
I am trying to run a loop where I can sum parts of a matrix. For
example, I want at each step in the loop to sum the the next 4-
values of a vector. I tried to do the following but the result were
wrong:
for (i in 4:T) {
data_q[i-3,]=sum(data_m[i-3,]:data_m[i,])
}
can anyone please direct me on what should I do to run this loop
properly
Thanks in advance
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and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
