R help - Jan 2006 - matlab-like constant matrix initialization?

Hi all,

Suppose I have the following matrix which is a constant matrix I've copied
from some other document:

1.2  3.4 1.4 ...
2.3  3.7 2.6 ...
...

How do I make it into a matrix or array in R?

What is the fastest way of initializing a constant matrix with this
copy/pasted values?

Thanks a lot!

	[[alternative HTML version deleted]]

Sorry Michael, but I don't understand your question.
If you want to intialize a constant matrix (there is not such thing in 
R, just create a numerical matrix and use it without changing its 
values), you just use matrix(). For help and arguments of the function, 
type:

 > ?matrix

Best,

Philippe Grosjean


Michael wrote:
> Hi all,
> 
> Suppose I have the following matrix which is a constant matrix I've
copied
> from some other document:
> 
> 1.2  3.4 1.4 ...
> 2.3  3.7 2.6 ...
> ...
> 
> How do I make it into a matrix or array in R?
> 
> What is the fastest way of initializing a constant matrix with this
> copy/pasted values?
> 
> Thanks a lot!
> 
> 	[[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
> 
>

> Suppose I have the following matrix which is a constant matrix I've
copied
> from some other document:
>
> 1.2  3.4 1.4 ...
> 2.3  3.7 2.6 ...
> ...
> How do I make it into a matrix or array in R?
> What is the fastest way of initializing a constant matrix with this
> copy/pasted values?
you cannot just paste it, you have to adapt it either like this

x <- matrix( c( 1.2, 3.4, 1.4,
                      2.3, 3.7, 2.6 ),
                  nrow = 2, byrow = TRUE)

or like this:

x <- rbind( c( 1.2, 3.4, 1.4 ),
                c( 2.3, 3.7, 2.6 ) )

The second is closer to ML's x = [1,2 3.4 1.4;2.3 3.7 2.6] but the
first is probably the more popular/recommended approach. If it's a
large matrix that you don't want to adapt manually I think the only
way is to go via an ascii text file.

I see that you come from Matlab and that you have asked some rather
basic questions. I really recommend you, that you read the manuals (as
indicated). And do read them 2 or 3 times as they are much denser than
the Matlab manuals.

If you are not able to attend a course (which IMHO is the best way to
learn R) I'd buy a book.
(http://www.r-project.org/doc/bib/R-publications.html). Maybe the
"John Verzani. Using R for Introductory Statistics" or "Uwe
Ligges.
Programmieren mit R" could help you.

Best regards,
Hans-Peter

Do you mean they are in the clipboard in the format shown?
If that is the case then do this:

  as.matrix(read.table("clipboard"))


On 1/30/06, Michael <comtech.usa at gmail.com>
wrote:
> Hi all,
>
> Suppose I have the following matrix which is a constant matrix I've
copied
> from some other document:
>
> 1.2  3.4 1.4 ...
> 2.3  3.7 2.6 ...
> ...
>
> How do I make it into a matrix or array in R?
>
> What is the fastest way of initializing a constant matrix with this
> copy/pasted values?
>
> Thanks a lot!
>
>        [[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
>