[R] data.frame bug?

[Chong Gu]

I'd like to create a data frame with components

> jk$x1
[1] 2
> jk$x2
         [,1] [,2]
[1,]    0    0

I used to be able to do it with

> jk <- data.frame(x1=2,x2=I(matrix(0,1,2)))

But now I get a error message.  

Can I still do what I want?  Thanks for any help.

Chong Gu
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