From ripley at stats.ox.ac.uk  Wed Nov 17 10:31:55 2004
From: ripley at stats.ox.ac.uk (Prof Brian Ripley)
Date: Wed Nov 17 10:32:07 2004
Subject: [Rd] R: prcomp documentation (PR#7372)
In-Reply-To: <20041117090959.606B11043D@slim.kubism.ku.dk>
References: <20041117090959.606B11043D@slim.kubism.ku.dk>
Message-ID: <Pine.LNX.4.61.0411170929140.19945@gannet.stats>

I have no idea what you mean by this.  prcomp works on a matrix, which has 
two dimensions, and what you mean by `dimensionality of the data' in PCA 
depends on whether you are doing R mode or Q mode PCA.

Have you read the references on the help page?

On Wed, 17 Nov 2004 clock@twibright.com wrote:

> help(prcomp) documentation doesn't say that dimensionality of the data treated
> is number of columns of the matrix. I suggest this to be added somewhere near
> the description of the matrix argument 'x'.

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


[Rd] R: prcomp documentation (PR#7372)
Prof Brian Ripley