Message-ID: <Pine.A41.4.44.0210171646390.56050-100000@homer22.u.washington.edu>
Date: 2002-10-17T23:50:07Z
From: Thomas Lumley
Subject: data.frame bug?
In-Reply-To: <200210172130.g9HLUu6d106484@odds.stat.purdue.edu>
On Thu, 17 Oct 2002, Chong Gu wrote:
>
> 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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