Re: [R] matrix in data.frame

From: michael watson (IAH-C) <michael.watson_at_bbsrc.ac.uk>
Date: Wed, 30 May 2007 11:15:51 +0100

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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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. Received on Wed 30 May 2007 - 10:24:43 GMT

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