[R] memory problem; Error: cannot allocate vector of size 915.5 Mb

[Dimitris.Kapetanakis]

Dear all,

I am trying to make some matrix operations (whose size I think is smaller
than what R allows) but the operations are not feasible when they run in one
session but it is feasible if they run separately while each operation is
totally independent of the other. I run the code in one session the error
that appears is:

Error: cannot allocate vector of size 915.5 Mb
R(16467,0xa0421540) malloc: *** mmap(size=960004096) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
R(16467,0xa0421540) malloc: *** mmap(size=960004096) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug

In the code that I run (next lines), if I do not include the last three
lines it runs perfectly, if I exclude operations to create the xMax again it
runs perfectly, if I include both G.search and xMax appears the error term.
Does anyone knows the solution of this problem or why this problem happens?

The code that I run is:

N<-250
x<-matrix(c(rnorm(N,-1.5,1), rnorm(N,1,1), rbinom(N,1,0.5)), ncol=3)
start<-(-1)
end<-3
step<-10^(-2)
n.steps<-(end-start)/step	
steps2  <-n.steps^2
grids<-seq(from=start+step, to=end, by=step)
xMax    <-matrix(0,N*steps2,3)
xMax[,1]<-rep(x[,1],steps2)	
xMax[,2]<-rep(x[,2],steps2)
xMax[,3]<-rep(x[,3],steps2)
G.search1<-as.matrix(rep(grids, n.steps, each=N))
G.search2<-as.matrix(rep(grids, N, each=n.steps))
G.search<-cbind(1,G.search1, G.search2)
 
Thank you

Dimitris


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