Dear List,
Hi! I am wondering what is the simplest way to subset a portion of columns
from a matrix.
For example, there is a matrix A (238,304*243). What is the simplest
way to get a sub-matrix B which comprises of column 1, 3, 5, 7,9,...(odd column
number) from matrix A?
Thank you very much for your help!
Best,
Allen
There are many ways. For example, you can do something like A[seq(1,dim(A)[2],2)] Julian Julian M. Burgos Fisheries Acoustics Research Lab School of Aquatic and Fishery Science University of Washington 1122 NE Boat Street Seattle, WA 98105 Phone: 206-221-6864 affy snp wrote:> Dear List, > > Hi! I am wondering what is the simplest way to subset a portion of columns > from a matrix. > > For example, there is a matrix A (238,304*243). What is the simplest > way to get a sub-matrix B which comprises of column 1, 3, 5, 7,9,...(odd column > number) from matrix A? > > Thank you very much for your help! > > Best, > Allen > > ______________________________________________ > 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 Julian,
Thanks for the help!
Best,
Allen
On Nov 9, 2007 11:08 PM, Julian Burgos <jmburgos at u.washington.edu>
wrote:> There are many ways. For example, you can do something like
>
> A[seq(1,dim(A)[2],2)]
>
> Julian
>
> Julian M. Burgos
>
> Fisheries Acoustics Research Lab
> School of Aquatic and Fishery Science
> University of Washington
>
> 1122 NE Boat Street
> Seattle, WA 98105
>
> Phone: 206-221-6864
>
>
>
>
> affy snp wrote:
> > Dear List,
> >
> > Hi! I am wondering what is the simplest way to subset a portion of
columns
> > from a matrix.
> >
> > For example, there is a matrix A (238,304*243). What is the simplest
> > way to get a sub-matrix B which comprises of column 1, 3, 5,
7,9,...(odd column
> > number) from matrix A?
> >
> > Thank you very much for your help!
> >
> > Best,
> > Allen
> >
> > ______________________________________________
> > 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.
> >
>
>
>
>
No problem. Actually, I missed a comma. You should do A[,seq(1,dim(A)[2],2)] Julian affy snp wrote:> Hi Julian, > > Thanks for the help! > > Best, > Allen > > > > On Nov 9, 2007 11:08 PM, Julian Burgos <jmburgos at u.washington.edu> wrote: > >> There are many ways. For example, you can do something like >> >> A[seq(1,dim(A)[2],2)] >> >> Julian >> >> Julian M. Burgos >> >> Fisheries Acoustics Research Lab >> School of Aquatic and Fishery Science >> University of Washington >> >> 1122 NE Boat Street >> Seattle, WA 98105 >> >> Phone: 206-221-6864 >> >> >> >> >> affy snp wrote: >> >>> Dear List, >>> >>> Hi! I am wondering what is the simplest way to subset a portion of columns >>> from a matrix. >>> >>> For example, there is a matrix A (238,304*243). What is the simplest >>> way to get a sub-matrix B which comprises of column 1, 3, 5, 7,9,...(odd column >>> number) from matrix A? >>> >>> Thank you very much for your help! >>> >>> Best, >>> Allen >>> >>> ______________________________________________ >>> 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. >>> >>> >> >> >>-- Julian M. Burgos Fisheries Acoustics Research Lab School of Aquatic and Fishery Science University of Washington 1122 NE Boat Street Seattle, WA 98105 Phone: 206-221-6864
I figured that out. I appreciate! Allen On Nov 9, 2007 11:25 PM, Julian Burgos <jmburgos at u.washington.edu> wrote:> No problem. Actually, I missed a comma. You should do > > A[,seq(1,dim(A)[2],2)] > > Julian > > > > affy snp wrote: > > Hi Julian, > > > > Thanks for the help! > > > > Best, > > Allen > > > > > > > > On Nov 9, 2007 11:08 PM, Julian Burgos <jmburgos at u.washington.edu> wrote: > > > >> There are many ways. For example, you can do something like > >> > >> A[seq(1,dim(A)[2],2)] > >> > >> Julian > >> > >> Julian M. Burgos > >> > >> Fisheries Acoustics Research Lab > >> School of Aquatic and Fishery Science > >> University of Washington > >> > >> 1122 NE Boat Street > >> Seattle, WA 98105 > >> > >> Phone: 206-221-6864 > >> > >> > >> > >> > >> affy snp wrote: > >> > >>> Dear List, > >>> > >>> Hi! I am wondering what is the simplest way to subset a portion of columns > >>> from a matrix. > >>> > >>> For example, there is a matrix A (238,304*243). What is the simplest > >>> way to get a sub-matrix B which comprises of column 1, 3, 5, 7,9,...(odd column > >>> number) from matrix A? > >>> > >>> Thank you very much for your help! > >>> > >>> Best, > >>> Allen > >>> > >>> ______________________________________________ > >>> 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. > >>> > >>> > >> > >> > >> > > -- > > Julian M. Burgos > > Fisheries Acoustics Research Lab > School of Aquatic and Fishery Science > University of Washington > > 1122 NE Boat Street > Seattle, WA 98105 > > Phone: 206-221-6864 > > >
Gabor Grothendieck
2007-Nov-10 04:34 UTC
[R] How to subset a portion of columns from a matrix
Or perhaps: A[, seq(1, ncol(A), 2)] On Nov 9, 2007 11:25 PM, Julian Burgos <jmburgos at u.washington.edu> wrote:> No problem. Actually, I missed a comma. You should do > > A[,seq(1,dim(A)[2],2)] > > Julian > > > > affy snp wrote: > > Hi Julian, > > > > Thanks for the help! > > > > Best, > > Allen > > > > > > > > On Nov 9, 2007 11:08 PM, Julian Burgos <jmburgos at u.washington.edu> wrote: > > > >> There are many ways. For example, you can do something like > >> > >> A[seq(1,dim(A)[2],2)] > >> > >> Julian > >> > >> Julian M. Burgos > >> > >> Fisheries Acoustics Research Lab > >> School of Aquatic and Fishery Science > >> University of Washington > >> > >> 1122 NE Boat Street > >> Seattle, WA 98105 > >> > >> Phone: 206-221-6864 > >> > >> > >> > >> > >> affy snp wrote: > >> > >>> Dear List, > >>> > >>> Hi! I am wondering what is the simplest way to subset a portion of columns > >>> from a matrix. > >>> > >>> For example, there is a matrix A (238,304*243). What is the simplest > >>> way to get a sub-matrix B which comprises of column 1, 3, 5, 7,9,...(odd column > >>> number) from matrix A? > >>> > >>> Thank you very much for your help! > >>> > >>> Best, > >>> Allen > >>> > >>> ______________________________________________ > >>> 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. > >>> > >>> > >> > >> > >> > > -- > Julian M. Burgos > > Fisheries Acoustics Research Lab > School of Aquatic and Fishery Science > University of Washington > > 1122 NE Boat Street > Seattle, WA 98105 > > Phone: 206-221-6864 > > > ______________________________________________ > 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. >
Thanks! Allen On Nov 9, 2007 11:34 PM, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:> Or perhaps: > > A[, seq(1, ncol(A), 2)] > > > On Nov 9, 2007 11:25 PM, Julian Burgos <jmburgos at u.washington.edu> wrote: > > No problem. Actually, I missed a comma. You should do > > > > A[,seq(1,dim(A)[2],2)] > > > > Julian > > > > > > > > affy snp wrote: > > > Hi Julian, > > > > > > Thanks for the help! > > > > > > Best, > > > Allen > > > > > > > > > > > > On Nov 9, 2007 11:08 PM, Julian Burgos <jmburgos at u.washington.edu> wrote: > > > > > >> There are many ways. For example, you can do something like > > >> > > >> A[seq(1,dim(A)[2],2)] > > >> > > >> Julian > > >> > > >> Julian M. Burgos > > >> > > >> Fisheries Acoustics Research Lab > > >> School of Aquatic and Fishery Science > > >> University of Washington > > >> > > >> 1122 NE Boat Street > > >> Seattle, WA 98105 > > >> > > >> Phone: 206-221-6864 > > >> > > >> > > >> > > >> > > >> affy snp wrote: > > >> > > >>> Dear List, > > >>> > > >>> Hi! I am wondering what is the simplest way to subset a portion of columns > > >>> from a matrix. > > >>> > > >>> For example, there is a matrix A (238,304*243). What is the simplest > > >>> way to get a sub-matrix B which comprises of column 1, 3, 5, 7,9,...(odd column > > >>> number) from matrix A? > > >>> > > >>> Thank you very much for your help! > > >>> > > >>> Best, > > >>> Allen > > >>> > > >>> ______________________________________________ > > >>> 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. > > >>> > > >>> > > >> > > >> > > >> > > > > -- > > Julian M. Burgos > > > > Fisheries Acoustics Research Lab > > School of Aquatic and Fishery Science > > University of Washington > > > > 1122 NE Boat Street > > Seattle, WA 98105 > > > > Phone: 206-221-6864 > > > > > > ______________________________________________ > > 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. > > >