data.frame bug?

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.

If your computer does what mine does then this isn't what gives an error
message. The error message comes when you print.

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

Error in data.frame(x1 = "2", x2 = c("0", "0"), check.names = FALSE,
row.names = "1") :
        row.names should specify one of the variables

jk$x1

[1] 2

jk$x2

[,1] [,2]
[1,]    0    0

and it's caused in format.data.frame by the fact that format(jk[[2]]) is a
vector, not a matrix.

	-thomas

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