[R] Newbie hung up with matrices
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri May 16 20:32:18 CEST 2003
On Fri, 16 May 2003 rwatkins at cornerstonelp.com wrote:
> I just started learning R. I'm trying to use the Help and the downloadable
> manuals. I am stuck on trying to multiply matrices. Can anyone please
> supply a couple of lines of code that I can plug into a fresh console to see
> how a double precision (1x3) matrix is multiplied by a double precision
> (3x3) matrix? I keep getting an error message,"Error in x%*%A: requires
> numeric matrix/vector arguments".
> I have some VBA and VB experience (thus a little Object Oriented
> programming experience), am I right in beliving that I am not "dimensioning"
> correctly? I have been trying the following example:
> A<-read.csv("test33.csv"), where the data is
You've forgotten header=TRUE, if you don't want A,B,C to be part of your
matrix. R comes with a Data Import/Export Manual: please consult it.
Brian D. Ripley, ripley at 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
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