Dear Arun and Barradas, millions of thanks. you guys always rock. regards eliza
> Date: Fri, 5 Oct 2012 14:41:38 -0700 > From: smartpink...@yahoo.com > Subject: Re: [R] loop for column substraction of a matrix > To: eliza_bo...@hotmail.com > CC: ruipbarra...@sapo.pt; r-help@r-project.org > > Hi, > > Sorry, I think I misunderstand your question (after reading Rui's solution). > > You can also try any of these to get the result if this is what you meant: > set.seed(1) > mat1<-matrix(sample(1:500,380,replace=TRUE),ncol=38) > res1<-t(do.call(rbind,lapply(1:ncol(mat1), function(i) > mat1[,i]-apply(mat1,1,sum)))) > #or > res1<-sapply(1:ncol(mat1), function(i) mat1[,i]-apply(mat1,1,sum)) > #or > res1<-mapply(FUN=function(i) mat1[,i]-rowSums(mat1), 1:ncol(mat1)) > A.K > > > > > > ----- Original Message ----- > From: eliza botto <eliza_bo...@hotmail.com> > To: "r-help@r-project.org" <r-help@r-project.org> > Cc: > Sent: Friday, October 5, 2012 4:05 PM > Subject: [R] loop for column substraction of a matrix > > > Dear useRs, > > > I have a matrix with 38 columns and 365 rows. what i want to do is the > following..... > > 1. subtracting from each column, first itself and then all the remaining > columns. More precisely, from column number 1, i will first subtract > itself(column 1) and then the remaining 37 columns. Afterwards i will take > column number 2 and do the same. In this way i want to proceed till 38th > column. > 2. i want to print the resulting matrix on A4 paper. > > Bundle of thanks in advance. > > best regards > 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. > [[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.
