[R] setting attributes
mdsumner at gmail.com
Fri Nov 5 05:44:08 CET 2010
David did help already, but if you want literally what the
Introduction uses then you'll need a vector with as many elements as
the final matrix (in David's example recyling applies to give 100
elements from the original 10).
z <- rep(0:9, each = 10)
attr(z, "dim") <- c(10,10)
That's simply a different route to the one shown by David, where the
repetition of z values is made explicit.
On Fri, Nov 5, 2010 at 3:32 PM, Stephen Liu <satimis at yahoo.com> wrote:
> Hi David,
> I'm learning R following the tutorial mentioned, nothing else. I got an error
> running the code. Please help.
> Stephen L
> ----- Original Message ----
> From: David Winsemius <dwinsemius at comcast.net>
> To: Stephen Liu <satimis at yahoo.com>
> Cc: r-help at r-project.org
> Sent: Fri, November 5, 2010 12:18:23 PM
> Subject: Re: [R] setting attributes
> On Nov 5, 2010, at 12:05 AM, Stephen Liu wrote:
>> Hi folks,
>> An Introduction to R
>> 3.3 Getting and setting attributes
>>> z <- 0:9
>>  0 1 2 3 4 5 6 7 8 9
>>> attr(z, "dim") <- c(10,10)
>> Error in attr(z, "dim") <- c(10, 10) :
>> dims [product 100] do not match the length of object 
>> Please help me to understand what mistake I committed? TIA
> If you want a 10 x 10 matrix then:
> zm <- matrix(z, 10, 10) # positional arguments to nrow and ncol.
> If you were trying for something else, then please explain in plain
> English rather than simply showing code that throws an error.
> David Winsemius, MD
> West Hartford, CT
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Institute for Marine and Antarctic Studies, University of Tasmania
e-mail: mdsumner at gmail.com
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