rowsum() may return a vector instead of a matrix (PR#3737)
On Tue, 12 Aug 2003, Thomas Lumley wrote:
On Wed, 13 Aug 2003 brahm@alum.mit.edu wrote:
If all rows are in the same "group", rowsum() returns a vector instead of a (1xN) matrix, contrary to documentation:
Yes, and it appears to be deliberate since rowsum.default() ends with drop(rval), though I don't remember why it was this way. Is there a strong preference for changing the function vs changing the documentation?
I'd change the function. The Therneau original function of this name returns a 1xN matrix, and it is easier to drop() that to reinstate.
Brian D. Ripley, ripley@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595