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]]
Hello, 1. Let me refrase it a bit. For each column, sum all others and take the symmetric. mat <- matrix(1:30, ncol = 3) sapply(seq_len(ncol(mat)), function(i) -rowSums(mat[, -i])) 2. write.table (maybe using sep = "\t" ?) and send the file to printer. Hope this helps, Rui Barradas Em 05-10-2012 21:05, eliza botto escreveu:> 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 at 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.
HI,
Try this:
set.seed(1)
?mat1<-matrix(sample(1:500,380,replace=TRUE),ncol=38)
list1<-list()
for(i in 1:ncol(mat1)){
?list1[[i]]<-t(apply(mat1,1,function(x) x[i]-x))
?list1}
list1
A.K.
----- Original Message -----
From: eliza botto <eliza_botto at hotmail.com>
To: "r-help at r-project.org" <r-help at 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
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??? [[alternative HTML version deleted]]
______________________________________________
R-help at 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.
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_botto at hotmail.com> To: "r-help at r-project.org" <r-help at 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 at 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.