filling values in a vector using smaller vector

Thank you both for such beautiful solutions.  Just what I was looking for!  I 
love the Internet, R, and the R-list!  There is so much opportunity to learn.  
In fact, looking at the replace function, I see the two solutions are the 
same:

replace

function (x, list, values)
{
    x[list] <- values
    x
}
<environment: namespace:base>

Thanks again.  You made my day.  Have a happy holiday season.

-milton
======================

Wacek Kusnierczyk wrote:

Milton Huang wrote:

Dear list members:

I am looking for an elegant (or efficient) way to accomplish the
following:

take a large boolean vector and fill the TRUE values with the values
from a smaller boolean vector that has a length that is the number of
TRUE values of the large vector.

Example:

large<- c(FALSE, FALSE, FALSE, TRUE, FALSE, FALSE,  TRUE, FALSE, FALSE,
FALSE, TRUE, FALSE)

small<- c(TRUE, FALSE, TRUE)

desired output = c(FALSE, FALSE, FALSE, *TRUE*, FALSE, FALSE,  *FALSE*,
FALSE, FALSE, FALSE, *TRUE*, FALSE)

replace(large, which(large), small)

in fact, this will do:

replace(large, large, small)

vQ

--------------------------
I believe the following does what is wanted:

desired <- large
desired[large] <- small


Patrick Burns
patrick at burns-stat.com
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")