On May 2, 2010, at 7:01 AM, burgundy wrote:


Hi,

I'm trying to replace all values equal to 1 in one file (a) with the value
in the corresponding column in a separate file (b). Example below.
Any help (and brief notes if poss) much appreciated. Thanks!!

file a:
0,0,1,1,0
1,0,0,0,1
0,0,0,0,0
1,0,1,1,0

You need to read the introductory material on reading files, and then you need to read the Posting Guide about how to present copy-pastable versions of r objects. Also look at:

?dput


file b:
3,4,6,8,11

Once that is done:

t( t(a)*b)



output request:
0,0,6,8,0
3,0,0,0,11
0,0,0,0,0
3,0,6,8,0

--

David Winsemius, MD
West Hartford, CT

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