Thanks, It worked. --- On Sun, 3/1/09, Jorge Ivan Velez <[email protected]> wrote:
From: Jorge Ivan Velez <[email protected]> Subject: Re: [R] Partial sum of a vector To: "Mohammad Sabr" <[email protected]> Cc: [email protected] 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 <[email protected]> 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 <[email protected]> wrote: From: Jorge Ivan Velez <[email protected]> Subject: Re: [R] Partial sum of a vector To: "Mohammad Sabr" <[email protected]> Cc: [email protected] 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 <[email protected]> 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 [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]]
______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
