thanks all; this makes sense now. For what
it's worth, this came up in the context of
mapply(...,SIMPLIFY=TRUE), which returned a
matrix as requested, but an odd-looking one.
cheers
Ben Bolker
__
R-help@stat.math.ethz.ch mailing list
Just to add to what others have said, don't confuse how an object is
printed with its structure. This must be intentional as the internal code
has a specific section just to print list arrays/matrices.
?matrix has the first argument as
data: an optional data vector.
and a list is a
As far as I can tell from reading The Fine Documentation
(R Language Definition and Intro to R), matrices are supposed
to be of homogeneous types. Yet giving matrix() an inhomogeneous
list seems to work, although it produces a peculiar object:
v = list(1:3,4,5,a)
m = matrix(v,nrow=2)
m
On Fri, 2005-10-21 at 21:32 +, Ben Bolker wrote:
As far as I can tell from reading The Fine Documentation
(R Language Definition and Intro to R), matrices are supposed
to be of homogeneous types. Yet giving matrix() an inhomogeneous
list seems to work, although it produces a peculiar
learning
process. - George E. P. Box
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ben Bolker
Sent: Friday, October 21, 2005 2:33 PM
To: r-help@stat.math.ethz.ch
Subject: [R] peculiar matrices
As far as I can tell from reading The Fine
The reference manual of 2.2.0 says in section
2.2 that Matrices and arrays are simply vectors
with the attribute dim and optionally dimnames.
Now earlier in section 2.1 it discusses vectors
and I think that that is where the confusing part lies.
Section 2.1 starts out saying that Vectors
can be
