From: Doran, Harold <HDoran_at_air.org>

Date: Sat, 02 Jun 2007 10:50:02 -0400

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. Received on Sat 02 Jun 2007 - 14:56:53 GMT

Date: Sat, 02 Jun 2007 10:50:02 -0400

Thanks for the clarification, Marc. Also, I should correct my error below. I wrote excel's limit is 16^2. But, it is 2^16 -1

-----Original Message-----

From: Marc Schwartz [mailto:marc_schwartz_at_comcast.net]
Sent: Fri 6/1/2007 6:23 PM

To: Doran, Harold

Cc: Guanrao Chen; r-help_at_stat.math.ethz.ch
Subject: Re: [R] What is the maximum size of a matrix?

Harold,

Actually there is a maximum size, even if one had sufficient memory.

Since a matrix is a vector with a dim attribute, and these objects are indexed using integers, the maximum sized vector one 'could' create is:

> .Machine$integer.max

[1] 2147483647

which is:

> 2^31 - 1

[1] 2147483647

and that does not differ on 64 bit systems.

**HTH,
**
Marc Schwartz

On Fri, 2007-06-01 at 17:36 -0400, Doran, Harold wrote:

> There is no maximum size. This will be driven by (at least) two issues.

*> First, how much memory you have on your own computer and second what
**> data you have in each cell. For instance, an integer takes less memory
**> than a floating point.
**>
**> Other spreadsheet programs like excel limit the number of rows to 16^2
**> irrespective of memory, but that is not true here.
**>
**> Harold
**>
**>
**> > -----Original Message-----
**> > From: r-help-bounces_at_stat.math.ethz.ch
**> > [mailto:r-help-bounces_at_stat.math.ethz.ch] On Behalf Of Guanrao Chen
**> > Sent: Friday, June 01, 2007 5:06 PM
**> > To: r-help_at_stat.math.ethz.ch
**> > Subject: [R] What is the maximum size of a matrix?
**> >
**> > hi, Rers
**> >
**> > I tried to find out the max size (# of rows, # of
**> > columns) of a matrix that is allowed by R but failed.
**> >
**> > Can anybody let me know?
**> >
**> > Thanks!
**> > Guanrao
**> >
*

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