> 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
> 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
