R help - Nov 2010 - replace a row in a matrix

Dear all,


I created a n*2 matrix and I want to replace the ith row with a vector. Can
anyone suggest me what is the simple way to do it? Sorry for bothering you
with such  simple question. I appreciate any hints or advice.


Thanks in advance.

Cassie

	[[alternative HTML version deleted]]

Hi Cassie,

If your matrix is named "X", and your vector "y", then:

X[i, ] <- y

Please read the documentation for the extraction operator.  You can
pull this up by entering the following command at the R console:

?"["

You would also probably benefit from a careful reading of this manual:
http://cran.r-project.org/doc/manuals/R-intro.pdf

I know it is 100 pages, but if you are going to use R much at all, the
time investment to read through that carefully will pay off (even if
it does not all make sense the first time through).

Cheers,

Josh


On Sun, Nov 14, 2010 at 7:59 AM, cassie jones <cassiejones26 at gmail.com>
wrote:
> Dear all,
>
>
> I created a n*2 matrix and I want to replace the ith row with a vector. Can
> anyone suggest me what is the simple way to do it? Sorry for bothering you
> with such ?simple question. I appreciate any hints or advice.
>
>
> Thanks in advance.
>
> Cassie
>
> ? ? ? ?[[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.
>


-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/

Indexing

(xx <- matrix(1:4, nrow=2))
vec <- 5:6

xx[2,] <- vec
xx




--- On Sun, 11/14/10, cassie jones <cassiejones26 at gmail.com> wrote:
> From: cassie jones <cassiejones26 at gmail.com>
> Subject: [R] replace a row in a matrix
> To: r-help at r-project.org
> Received: Sunday, November 14, 2010, 10:59 AM
> Dear all,
> 
> 
> I created a n*2 matrix and I want to replace the ith row
> with a vector. Can
> anyone suggest me what is the simple way to do it? Sorry
> for bothering you
> with such? simple question. I appreciate any hints or
> advice.
> 
> 
> Thanks in advance.
> 
> Cassie
> 
> ??? [[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.
>