[R] matrix in data.frame

[michael watson (IAH-C)]

Have you thought of using a list?

> a <- matrix(1:10, nrow=2)
> b <- 1:5
> x <- list(a=a, b=b)
> x
$a
     [,1] [,2] [,3] [,4] [,5]
[1,]    1    3    5    7    9
[2,]    2    4    6    8   10

$b
[1] 1 2 3 4 5

> x$a
     [,1] [,2] [,3] [,4] [,5]
[1,]    1    3    5    7    9
[2,]    2    4    6    8   10
> x$b
[1] 1 2 3 4 5
 

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Lina
Hultin-Rosenberg
Sent: 30 May 2007 10:26
To: r-help at stat.math.ethz.ch
Subject: [R] matrix in data.frame

Dear list!

I have run into a problem that seems very simple but I can't find any
solution to it (have searched the internet, help-files and "An
introduction
to R" etc without any luck). The problem is the following: I would like
to
create a data.frame with two components (columns), the first component
being
a matrix and the second component a vector. Whatever I have tried so
far, I
end up with a data.frame containing all the columns from the matrix plus
the
vector which is not what I am after. I have seen this kind of data.frame
among R example datasets (oliveoil and yarn).

I would greatly appreciate some help with this problem!

Kind regards,

Lina Hultin Rosenberg
Karolinska Biomics Center
Karolinska Institute
Sweden

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