Thanks,
It worked.
--- 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, 11:20 PM
Hi Mohammad,
You need to download and then install the zoo package. Here is an example:
> install.packages('zoo')
> require(zoo)
> x<-1:20
> 4*rollmean(x,4)
[1] 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74
HTH,
Jorge
On Sun, Mar 1, 2009 at 10:16 PM, Mohammad Sabr <mohammad_s...@yahoo.com> 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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