Message-ID: <Pine.GSO.4.10.10304231347080.1906-100000@quetelet.stat.ucla.edu>
Date: 2003-04-23T20:50:29Z
From: Roger D. Peng
Subject: sum
In-Reply-To: <3A822319EB35174CA3714066D590DCD5C4FA47@usrymx25.merck.com>
Yes, the definition of "binary operator" seems to have escaped me this
morning. I was looking for something along the lines of Deepayan's
answer.
-roger
_______________________________
UCLA Department of Statistics
http://www.stat.ucla.edu/~rpeng
On Wed, 23 Apr 2003, Liaw, Andy wrote:
> Won't work if the list has more than 2 matrices.
>
> Andy
>
> > From: Roger Peng [mailto:rpeng at stat.ucla.edu]
> >
> > How about something like:
> >
> > > matlist <- list(matrix(1:16, 4, 4), matrix(2, 4, 4))
> > > do.call("+", matlist)
> > [,1] [,2] [,3] [,4]
> > [1,] 3 7 11 15
> > [2,] 4 8 12 16
> > [3,] 5 9 13 17
> > [4,] 6 10 14 18
> > >
> >
> > -roger
> > _______________________________
> > UCLA Department of Statistics
> > http://www.stat.ucla.edu/~rpeng
> >
> > On Wed, 23 Apr 2003, Luis Silva wrote:
> >
> > > Dear helpers
> > >
> > > I have a list where each element is a matrix (the list is
> > > obtained with lapply). I want to sum those matrices. Is there a
> > > function to do that? The sum function sums all the elements...
> > > --
> > >
> > >
> > > http://adsl.sapo.pt
> > >
> > > ______________________________________________
> > > R-help at stat.math.ethz.ch mailing list
> > > https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> > >
> >
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> >
>
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