Hi Kevin, Joshua,
Many thanks for this additional information.
On 10 Nov 2014, at 22:21, Kevin Ushey wrote:
I believe the question here is related to the sign on the compact row
names representation: why is it sometimes `c(NA, )` and
sometimes `c(NA, )` -- why the difference in sign?
It was
I believe the question here is related to the sign on the compact row
names representation: why is it sometimes `c(NA, )` and
sometimes `c(NA, )` -- why the difference in sign?
To the best of my knowledge, older versions of R used the signed-ness
of compact row.names to differentiate between diffe
On Mon, Nov 10, 2014 at 12:35 PM, Dr Gregory Jefferis
wrote:
> Dear R-devel,
>
> Can anyone help me to understand this? It seems that subscripting the rows
> of a data.frame without actually changing their order, somehow changes an
> internal representation of row.names that is revealed by e.g.
>
Dear R-devel,
Can anyone help me to understand this? It seems that subscripting the
rows of a data.frame without actually changing their order, somehow
changes an internal representation of row.names that is revealed by e.g.
dput/dump/serialize
I have read the docs and inspected the (R) code
> Duncan Murdoch
> on Wed, 5 Nov 2014 10:22:09 -0500 writes:
> On 05/11/2014 9:36 AM, Peter Simons wrote:
>> Hi Duncan,
>>
>> > I don't think we should be removing tests for everybody to allow a few
>> > people to test a build of R that none of us actually use.
> Presumably, the help file wording goes back to S-PLUS which
> (to my recollection) didn't allow zero-extent matrices.
Splus (and S) started having reasonable support for zero-extent
matrices in May 2001 (i.e., Splus 6.0, which I think corresponds
to S version 4-m of June 2, 1999), Splus5.0 (Nov
I found a strange bug in R recently (version 3.1.2):
As you can see from the screenshots attached, when the cursor passes the
right edge of the console, instead of start on a new line, it goes back to
the beginning of the same line, and overwrites everything after it.
This happens every time the
> peter dalgaard
> on Mon, 10 Nov 2014 14:47:16 +0100 writes:
> There is a maintainer for this contributed package...
> However, a zero column vector _is_ numeric(0) -- with
> dimension attributes c(3,0).
> structure(numeric(0),dim=c(3,0))
> c(Null(diag(3)))
There is a maintainer for this contributed package...
However, a zero column vector _is_ numeric(0) -- with dimension attributes
c(3,0).
structure(numeric(0),dim=c(3,0))
c(Null(diag(3)))
I.e., the ambiguity is pretty slight.
Presumably, the help file wording goes back to S-PLUS which (to my
Hi,
Function Null from package MASS seems to return a matrix with zero columns and
the expected number of rows when
the null space of the argument contains only the zero vector, e.g.
> library(MASS)
> diag(nrow=3)
[,1] [,2] [,3]
[1,]100
[2,]010
[3,]001
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