dear all,
i have a quite simple question, i want to fill up a Matrix like done in the
following function,
but the performance is very bad for large dimensions
is there a way to do this like with apply or something similar?
makeMatrix <- function(a, b,dim) {
X=matrix(0,ncol=dim,nrow=dim)
for (i in c(1:dim)){
for (j in c(1:dim)) {
if (i==j) {X[i,j]<-a}
else { X[i,j]<- exp(( -1*abs(i-j))/(3*b)) }
}
}
X
}
--
View this message in context:
http://r.789695.n4.nabble.com/fill-Matrix-quicker-tp3710428p3710428.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help@r-project.org 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.
