R-beta: vector + data.frame

[Martyn Plummer]

I was getting some strange results adding two matrices
together, when I eventually worked out that one of them
was a data frame (they both look the same when you print
them!). I was surprised to discover the following behaviour:

1) When a matrix is added to a data frame, they do not
have to conform. In fact the matrix is treated like a vector.

2) When a vector is added to a data frame, there is no check
to see if the number of rows in the data frame is a multiple
of the vector length.

Even more surprisingly, this is exactly the same as the
behaviour of S-PLUS. Bug or feature?

Martyn
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