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

Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


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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