[R] Data matrix of all possible response patterns

[Charles C. Berry]

mat <- outer( 0:9, 0:(1024-1), function(x,y) y %/% (2^x) %% 2 )

On Thu, 26 Jun 2008, Daniel Folkinshteyn wrote:

> this is probably a cludge, and there may be a "neater" way to do this, but... 
> here's one:
>
>>  a = 0:1
>>  for (i in 1:9){ a= merge(unname(a), 0:1) }
>>  a = t(a)
>
> after the for loop, 'a' will contain a 1024 row by 10 col dataframe. putting 
> it through a transpose, gives you the 10 rows by 1024 cols matrix.
>
> on 06/26/2008 02:18 PM SARAH A DEPAOLI said the following:
>>  I am looking for a way to generate a data matrix that contains all
>>  possible response patterns for 10 binary items. This should produce a
>>  matrix with 10 rows (representing 10 items) and 1024 columns (representing
>>  2^10 possible response patterns). Does anyone know of code that would
>>  produce such a matrix?
>>  Thanks!
>>  Sarah Depaoli
>>
>>  ______________________________________________
>>  R-help at 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.
>> 
>
> ______________________________________________
> R-help at 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.
>
>

Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901