R help - Jun 2011 - Adding objects to a list

#Hi list,

#From the code below I get two list objects (n$values and n$vectors):
dat <- matrix(1:9,3)
n<-eigen(dat)
n

# How do I add another object to n that replicates n$vectors and is called
n$vectors$test?
# Thanks a lot!





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How about using the available introductory material for such basic questions?

This link for example will tell you what to do:

http://cran.r-project.org/doc/manuals/R-intro.html#Constructing-and-modifying-lists


HTH
Jannis

--- mdvaan <mathijsdevaan at gmail.com> schrieb am Mo, 20.6.2011:
> Von: mdvaan <mathijsdevaan at gmail.com>
> Betreff: [R] Adding objects to a list
> An: r-help at r-project.org
> Datum: Montag, 20. Juni, 2011 09:00 Uhr
> #Hi list,
> 
> #From the code below I get two list objects (n$values and
> n$vectors):
> dat <- matrix(1:9,3)
> n<-eigen(dat)
> n
> 
> # How do I add another object to n that replicates
> n$vectors and is called
> n$vectors$test?
> # Thanks a lot!
> 
> 
> 
> 
> 
> --
> View this message in context:
http://r.789695.n4.nabble.com/Adding-objects-to-a-list-tp3610821p3610821.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
> 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.
>

On Jun 20, 2011, at 5:00 AM, mdvaan wrote:
> #Hi list,
>
> #From the code below I get two list objects (n$values and n$vectors):
One of which is a numeric vector and the other of which is a
matrix.
> dat <- matrix(1:9,3)
> n<-eigen(dat)
> n
>
> # How do I add another object to n that replicates n$vectors and is  
> called
> n$vectors$test?
> # Thanks a lot!
Maybe you should explain what your goal is. At the moment n$vectors is  
not a list but rather a matrix. As such assignment of <anything> to n 
$vectors$test will result in coercion of the matrix elements to  
individual list elements, as you should have seen from the warning  
message when you tried the obvious.

 > n$vectors$test <- n$vectors
Warning message:
In n$vectors$test <- n$vectors : Coercing LHS to a list

 > n
$values
[1]  1.611684e+01 -1.116844e+00 -5.700691e-16

$vectors
$vectors[[1]]
[1] -0.4645473

$vectors[[2]]
[1] -0.5707955

$vectors[[3]]
[1] -0.6770438

$vectors[[4]]
[1] -0.882906

$vectors[[5]]
[1] -0.2395204

$vectors[[6]]
[1] 0.4038651

$vectors[[7]]
[1] 0.4082483

$vectors[[8]]
[1] -0.8164966

$vectors[[9]]
[1] 0.4082483

$vectors$test
            [,1]       [,2]       [,3]
[1,] -0.4645473 -0.8829060  0.4082483
[2,] -0.5707955 -0.2395204 -0.8164966
[3,] -0.6770438  0.4038651  0.4082483

So the tenth element of n$vectors (which is now of a different class)  
will be the desired result but you have 9 list elements that were the  
original matrix values

 > n$vectors[[10]]
            [,1]       [,2]       [,3]
[1,] -0.4645473 -0.8829060  0.4082483
[2,] -0.5707955 -0.2395204 -0.8164966
[3,] -0.6770438  0.4038651  0.4082483
>
>
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Adding-objects-to-a-list-tp3610821p3610821.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.
David Winsemius, MD
West Hartford, CT