Add multiple columns using for loop in R and name with row entry

I have searched and can't find the answer to this, though it seems like a pretty basic R question.

I am trying to add multiple columns to a dataframe using a for loop. I would also like each column to be named with the row entry that it corresponds to.

Here is an example:

    > test <- data.frame(cbind(x=1, y=1:10))
    > test
    x  y
    1  1
    1  2
    1  3
    1  4
    1  5
    1  6
    1  7
    1  8
    1  9
    1 10

I then tried this:

    y <- test$y
    for (i in y) { test$i <- rep(c(test$y [i]), times=length(test$y)) }

which gave me this:

    > test
    x  y  i
    1  1 10
    1  2 10
    1  3 10
    1  4 10
    1  5 10
    1  6 10
    1  7 10
    1  8 10
    1  9 10
    1 10 10

However, what I wanted was this:

    > test
    x  y  1  2  3  4  5  6  7  8  9  10
    1  1  1  2  3  4  5  6  7  8  9  10
    1  2  1  2  3  4  5  6  7  8  9  10
    1  3  1  2  3  4  5  6  7  8  9  10
    1  4  1  2  3  4  5  6  7  8  9  10
    1  5  1  2  3  4  5  6  7  8  9  10
    1  6  1  2  3  4  5  6  7  8  9  10
    1  7  1  2  3  4  5  6  7  8  9  10
    1  8  1  2  3  4  5  6  7  8  9  10
    1  9  1  2  3  4  5  6  7  8  9  10
    1 10  1  2  3  4  5  6  7  8  9  10

What am I doing wrong? I'd really appreciate any help you can give!