R help - Sep 2004 - How to personalize the rpart function: t.default(x)

I'm trying to personalize the rpart function by introducing a
list('init','split','eval') in the argument method. But
I receive an error
message:"Error in t.default(x): argument is not a matrix".
Can anyone tell me what the argument of this function is or where this
function appears in the rpart function.Thanks Simone Vantini

t is for transpose; look at ?t, ?t.default,
?t.data.frame

Bottom line:  Somewhere in your code you are trying to transpose
something that is not a matrix.  (Or you are passing to an existing
function an object which that function expects to be a matrix, but
isn't.)

			cheers,

				Rolf Turner
				rolf at math.unb.ca

On top of what Rolf had said, traceback() would help tracking down how the
error happened.

Andy
> From: Rolf Turner
> 
> t is for transpose; look at ?t, ?t.default,
> ?t.data.frame
> 
> Bottom line:  Somewhere in your code you are trying to transpose
> something that is not a matrix.  (Or you are passing to an existing
> function an object which that function expects to be a matrix, but
> isn't.)
> 
> 			cheers,
> 
> 				Rolf Turner
> 				rolf at math.unb.ca
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
> 
>

On Thu, 2 Sep 2004, Simone Vantini wrote:
> I'm trying to personalize the rpart function by introducing a
> list('init','split','eval') in the argument method.
But I receive an error
> message:"Error in t.default(x): argument is not a matrix".
> Can anyone tell me what the argument of this function is or where this
> function appears in the rpart function.Thanks Simone Vantini
t.default is the default method for the transpose function t() in R 
itself.

Try help!

Description:

     Given a matrix or 'data.frame' 'x', 't' returns the
transpose of
     'x'.


-- 
Brian D. Ripley,                  ripley at 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