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