[R] A question about "union"

[Leon Yee]

Dear all,

    I have a question about "union".  "union" handles two vectors' 
elements to get their union, but I have many vectors and I want to get 
the union of all of them. So I wrote a loop:

all <-c();
for(var in ls(pattern="xyz"))
# all of the vectors with pattern of "xyz"
{
    all <- union(all, var);
}


but the result is like this: ("xyzblabla1", "xyzblabla2", "abcxyz", ... 
) -- just a collection of the variable names, not the union of their 
elements.

How can I solve this problem?

thanks!

Leon