[R] extracting rows and columns from a big matrix
arun
smartpink111 at yahoo.com
Mon Jul 16 04:09:05 CEST 2012
Hello,
In my previous email, I used index to subset the data. Then, I looked at your code. I guess you wanted to try the "subset" function to get the same output.
Try this:
dat1<-read.table(text="
X1 X7 X12 X15 X22 X26 X31 X34 X39 X44 X51
X1 1 2 3 4 5 6 7 8 9 10 11
X7 11 9 7 5 3 1 10 8 6 4 2
X12 3 4 7 8 5 7 2 9 1 3 2
X15 9 9 8 4 7 1 1 3 2 5 3
X22 6 7 7 4 4 2 9 8 8 1 1
X26 3 9 4 8 5 7 6 1 2 3 8
X31 1 2 1 3 1 4 1 5 1 6 1
X34 6 7 8 5 2 9 5 1 6 8 9
X39 4 8 7 4 6 5 1 9 2 7 5
X44 2 2 2 8 6 7 9 5 3 7 7
X51 9 9 9 6 6 4 8 7 2 1 3
",sep="", header=TRUE)
subset(dat1,subset=row.names(dat1)%in% c("X1","X12","X22","X31"),select=c("X1","X12","X22","X31"))
X1 X12 X22 X31
X1 1 3 5 7
X12 3 7 5 2
X22 6 7 4 9
X31 1 1 1 1
A.K.
----- Original Message -----
From: A J <anxusgo at hotmail.com>
To: jholtman at gmail.com
Cc: r-help at r-project.org
Sent: Sunday, July 15, 2012 3:43 PM
Subject: Re: [R] extracting rows and columns from a big matrix
Sorry so much for mistakes.
It was an example code and I commited some mistakes typing it. But meaning the original code is right (I have checked several times) I am not sure about how to solve the problem of extracting columns and rows using labels from a squared matrix. I have enclosed a text file with the idea in order to understand it better.
Thanks again, and sorry for the inconvenience.
Best,
AJ
> Date: Sun, 15 Jul 2012 14:53:47 -0400
> Subject: Re: [R] extracting rows and columns from a big matrix
> From: jholtman at gmail.com
> To: anxusgo at hotmail.com
> CC: r-help at r-project.org
>
> For a start, you are missing a quote and a parenthese on the
> statement; probably should be: (another quote was also missing)
>
> n<-subset(m, select=c("X1", "X7", "X12","X15", "X22", "X26", "X31",
> "X34", "X39", "X44", "X51", "X58"))
>
> Not sure what you want with the rownames; an example would help and
> post with 'dput'.
>
> On Sun, Jul 15, 2012 at 2:47 PM, A J <anxusgo at hotmail.com> wrote:
> >
> > Hi there and thanks in advance.
> >
> > I have a large symmetrical matrix stored in a text file. After load in R I would like to extract the same number of columns and rows (symmetrical submatrix) using their labels.
> >
> > I have tried this code in order to extract columns, but R console gives me the "+" sign at the end of the code, pointing out incomplete command, so it is not working:
> >
> > m<-read.table("C:/backup/symmetrical.csv")
> >
> > n<-subset(m, select=c("X1", "X7", "X12", X15", "X22", "X26", "X31", "X34", "X39", "X44", "x51", "X58)
> >
> > Therefore, I have no tried with row names yet.
> >
> > Any suggestions? Sorry for the inconvenience. I have read some information about this but always have the same problem with "+" and I do not have any idea to follow.
> >
> > Best,
> >
> > AJ
> >
> >
> >
> >
> > [[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.
>
>
>
> --
> Jim Holtman
> Data Munger Guru
>
> What is the problem that you are trying to solve?
> Tell me what you want to do, not how you want to do it.
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