Hi Eliza,
No problem.
You can also do:
lst1 <- vector("list",12)
for(i in seq_along(lst1)) lst1[[i]] <- colMeans(AAA[seq(i,nrow(AAA), by=12),])
A.K.On Wednesday, May 28, 2014 4:17 AM, eliza botto <eliza_bo...@hotmail.com> wrote: Thankyou very much dennis and arun, The codes worked as ever. :D Eliza > Date: Tue, 27 May 2014 18:43:44 -0700 > From: smartpink...@yahoo.com > Subject: Re: [R] row mean > To: r-help@r-project.org > CC: eliza_bo...@hotmail.com > > > > Forgot, about the mean: > lapply(split(seq_len(nrow(AAA)),((seq_len(nrow(AAA))-1)%%12)+1),function(i) > colMeans(AAA[i,])) > A.K. > > > On , arun <smartpink...@yahoo.com> wrote: > > > Hi Eliza, > May be this helps: > lapply(split(seq_len(nrow(AAA)),((seq_len(nrow(AAA))-1)%%12)+1),function(i) > AAA[i,]) > A.K. > > > > > > On Tuesday, May 27, 2014 6:48 PM, eliza botto <eliza_bo...@hotmail.com> wrote: > Dear R family, > I have this matrix say > AAA<-matrix(sample(1:240),ncol=2) > I first want to combine every 13th row in both columns. precisely, starting > from row-1 1,13,25,37,49,.... then starting from row-2 > 2,14,26,38,50 also 3,15,27,39,51 and similarly starting from row 4, row > number 5, row 6... till 12th row,for both columns. so in a way > we will have list of 12 matrices each with 10 rows and 2 columns. > Finally, I want to calculate mean of each column of each matrix in that list, > while keeping the integrity of the list intact. > Kindly Advice! > > Thankyou very much indeed in advance. > Eliza > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org 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. ______________________________________________ R-help@r-project.org 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.
