R help - Jan 2011 - vector or list of matrices corresponding to an observation

Dear all,

I observe for each observation several joint distributions of two
multinomial random variables (5x5 matrices). Right now, data are
arranged so that I have 20 columns for each joint distribution by
observation, which is not practical.

I would like to work with matrices that would be indexed by
observation, just as I work with vectors and matrices for regression
like analysis.

How should I proceed? With a list of list of matrices and how to build
it in a systematic way (n=3000 and I observe up to 10 joint
distributions by observation)?

I'm not familiar with such procedure and I don't know where I should
start reading.

Thanks!

Best,
SL

You're  right Jim. I have now started to work with list of matrices.
I'm not sure that it is a clean and nice code but it works.

I was wondering if there was a synthetic but advanced tutorial on
list() and associated functions?

Stephane

---------- Forwarded message ----------
From: jim holtman <jholtman at gmail.com>
Date: 2011/1/12
Subject: Re: [R] vector or list of matrices corresponding to an observation
To: SL <sl465 at yahoo.fr>


An actual example of your data would be useful along with how you
might want to access it. ?You can create a matrix of 'list' objects
and these could contain your matrices, but not knowing what the data
looks like, or how you intend to use it, make it hard to provide a
solution.