[R] Data matrix of all possible response patterns

Daniel Folkinshteyn dfolkins at gmail.com
Thu Jun 26 20:39:42 CEST 2008

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
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