[R] Matrix operations in a list
Christos Hatzis
christos at nuverabio.com
Tue Jan 23 16:46:35 CET 2007
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
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