R-beta: vector + data.frame
plummer at iarc.fr
Fri Aug 21 15:45:51 CEST 1998
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?
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