Hi R, I have a vector V1 of unknown length, say n. I need to convert this into a matrix C of row size=5, and accordingly the column should be updated. I tried with: C=as.matrix(V1,5,n/5) But it is not working...Could somebody help me on this? Thanks in advance... [[alternative HTML version deleted]]
Shubha Vishwanath Karanth wrote:> Hi R, > > > > I have a vector V1 of unknown length, say n. I need to convert this into > a matrix C of row size=5, and accordingly the column should be updated. > I tried with: > > > > C=as.matrix(V1,5,n/5) > > > > But it is not working...Could somebody help me on this?matrix(), not as.matrix() The help page for as.matrix displays quite clearly that as.matrix takes only a single argument x. You can also set the dimensions using dim(V1) <- c(5, n/5)> > > Thanks in advance... > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at stat.math.ethz.ch 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. >-- O__ ---- Peter Dalgaard ?ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
Shubha Vishwanath Karanth wrote:> Hi R, > > I have a vector V1 of unknown length, say n. I need to convert this into > a matrix C of row size=5, and accordingly the column should be updated. > I tried with: > > C=as.matrix(V1,5,n/5) > > But it is not working...Could somebody help me on this?You could try the following: matrix(V1, nrow=5) but note what happens when the length of V1 is not a multiple of 5.> Thanks in advance... > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at stat.math.ethz.ch 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.-- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894
check the help page for ?matrix(); you probably want either
matrix(V1, nrow = 5)
or
matrix(V1, nrow = 5, byrow = TRUE)
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
----- Original Message -----
From: "Shubha Vishwanath Karanth" <shubhak at ambaresearch.com>
To: <r-help at stat.math.ethz.ch>
Sent: Tuesday, January 23, 2007 3:10 PM
Subject: [R] Vector to Matrix transformation
> Hi R,
>
>
>
> I have a vector V1 of unknown length, say n. I need to convert this
> into
> a matrix C of row size=5, and accordingly the column should be
> updated.
> I tried with:
>
>
>
> C=as.matrix(V1,5,n/5)
>
>
>
> But it is not working...Could somebody help me on this?
>
>
>
> Thanks in advance...
>
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
>
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
How to suppress the recycling of items in a matrix..instead NA can be filled. -----Original Message----- From: Chuck Cleland [mailto:ccleland at optonline.net] Sent: Tuesday, January 23, 2007 8:00 PM To: Shubha Vishwanath Karanth Cc: r-help at stat.math.ethz.ch Subject: Re: [R] Vector to Matrix transformation Shubha Vishwanath Karanth wrote:> Hi R, > > I have a vector V1 of unknown length, say n. I need to convert thisinto> a matrix C of row size=5, and accordingly the column should beupdated.> I tried with: > > C=as.matrix(V1,5,n/5) > > But it is not working...Could somebody help me on this?You could try the following: matrix(V1, nrow=5) but note what happens when the length of V1 is not a multiple of 5.> Thanks in advance... > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code.-- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894