# Re: [R] joining matrices, vectors, scalars in one object

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>
Date: Thu, 13 Mar 2008 14:31:21 +0100

I think you need:

thing <- vector("list", 4)
for (i in seq_along(thing)) {

thing[[i]] <- # what you want to put here }

Best,
Dimitris

Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium

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Fax: +32/(0)16/337015
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```
• Original Message ----- From: "Gonçalo Ferraz" <gferraz29_at_gmail.com> To: <r-help_at_stat.math.ethz.ch> Sent: Thursday, March 13, 2008 2:04 PM Subject: [R] joining matrices, vectors, scalars in one object

Hi,

I have:

```a <- matrix(c(0,1,0,1),nrow=2)
b <- matrix(c(1,1,1,0,0,0),nrow=3)
c <- 1
d <- c(1,0,1)

```

And I would like to join them in an object 'thing' so that I can access a, b, c, or d through an index in a for loop.

For example:
thing[4]
would return
[1] 1 0 1

Note however, that I have many of these 'thing' components. So many that a command like

thing <- list(a = matrix(c(0,1,0,1),nrow=2), b = matrix(c (1,1,1,0,0,0),nrow=3), c = 1, d = c(1,0,1))

would become long and awkward.

Is there a way of declaring an empty 'thing' of a given length and then assigning its elements from a for loop? I need to allow elements a, b, c... that can be scalars, vectors or matrices with varying dimensions.

Thanks!

Gonçalo

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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 Thu 13 Mar 2008 - 13:48:51 GMT

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