[R] Help for R (Advanced matrix addition (large or undefined number of matrices)

Ben Bolker bolker at ufl.edu
Wed Aug 12 13:55:30 CEST 2009

Rusyte, Lina wrote:
> Dear Sirs,
> I would like to ask you, what function can I use for matrices addition?
> I couldn't find any information about it in the manual or in the
> internet.
> (A+B suits, when the number of matrixes is small, function sum() doesn't
> suit for matrices addition, because it sums all variables in the
> matrices and produces as an answer single number, not a matrix).
> I would be very thankful for your help.

 If you can get your matrices into a list, use Reduce():

> A = matrix(runif(100),nrow=10)
> B = Reduce("+",list(A,A,A,A,A))
> max(abs(B-5*A))
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