From: Martyn Plummer <plummer_at_iarc.fr>

Date: Thu 13 Oct 2005 - 21:45:50 EST

This message and its attachments are strictly confidential. ...{{dropped}}

R-help@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 Received on Thu Oct 13 21:56:02 2005

Date: Thu 13 Oct 2005 - 21:45:50 EST

On Thu, 2005-10-13 at 12:19 +0200, Muhammad Subianto wrote:

> Hi all,

*> I want to make all possible combination from dataset below:
**> V1 <- c(0,1,2)
**> V2 <- c(0,1)
**> V3 <- c(0,1)
**> V4 <- c(0,1)
**> V5 <- c(0,1)
**> V6 <- c(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)
**> V7 <- c(0,1,2,3,4,5,6)
**> V8 <- c(0,1)
**> V9 <- c(0,1)
**> V10 <- c(0,1)
**> V11 <- c(0,1)
**> V12 <- c(0,1)
**> V13 <- c(0,1)
**> V14 <- c(0,1)
**> V15 <- c(0,1,2,3,4,5,6,7,8,9)
**> V16 <- c(0,1,2,3,4,5,6)
**> V17 <- c(0,1,2,3,4,5,6,7,8)
**> V18 <- c(0,1,2,3,4,5)
**> V19 <- c(0,1)
**> V20 <- c(0,1,2,3,4,5,6,7)
**>
**> When run expand.grid I found a problem:
**> > all.V <-
**> expand.grid(V1,V2,V3,V4,V5,V6,V7,V8,V9,V10,V11,V12,V13,V14,V15,V16,V17,V18,V19,V20)
**> Error in rep.int(rep.int(x, rep.int(rep.fac, nx)), orep) :
**> invalid number of copies in rep()
**> In addition: Warning message:
**> NAs introduced by coercion
**> >
**>
**> Then I try to reduce:
**> > all.V.miss <-
**> expand.grid(V1,V2,V3,V4,V5,V7,V8,V9,V10,V11,V17,V18,V19,V20)
**> Error: cannot allocate vector of size 36288 Kb
**> >
**> What is that? Is this about memory or I must run on machine 64bit?
**>
**> Regards, Muhammad Subianto
**> P4 2.0GHz 512MB RAM
*

It's all about memory. In your first example, you are trying to create a data frame with 20 columns and 54 billion (thousand million) rows. Just to store this amount of data as an array of doubles you would need 8 terabytes of memory. You are being a bit optimistic trying to do it with only 500 Megabytes.

Martyn

> > R.version$platform

*> [1] "i686-redhat-linux-gnu"
**> > R.version$major
**> [1] "2"
**> > R.version$minor
**> [1] "1.1"
**> > R.version$year
**> [1] "2005"
**> > R.version$month
**> [1] "06"
**> > R.version$language
**> [1] "R"
*

This message and its attachments are strictly confidential. ...{{dropped}}

R-help@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 Received on Thu Oct 13 21:56:02 2005

*
This archive was generated by hypermail 2.1.8
: Fri 03 Mar 2006 - 03:40:44 EST
*