[R] Matrix operations in a list

[Christos Hatzis]

Try,

mapply('%*%', a, b, SIMPLIFY=FALSE)

-Christos 

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Doran, Harold
Sent: Tuesday, January 23, 2007 10:22 AM
To: r-help at stat.math.ethz.ch
Subject: [R] Matrix operations in a list

I have matrices stored within a list like something as follows:

a <- list(matrix(rnorm(50), ncol=5), matrix(rnorm(50), ncol=5)) b <-
list(matrix(rnorm(50), nrow=5), matrix(rnorm(50), nrow=5))

I don't recall how to perform matrix multiplication on each list element
such that the result is a new list 

result <- list(a[[1]]%*%b[[1]], a[[2]]%*%b[[2]])

I think I'm close with mapply(), but I'm doing something silly

mapply('%*%', a,b)

Thanks.
Harold


	[[alternative HTML version deleted]]

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.