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,] 1 0 0
[2,] 0 1 0
[3,] 0 0 1
> Null(diag(nrow=3))
[1,]
[2,]
[3,]
But the documentation of Null seems to imply that the result is numeric(0):
-----------------------------------------------
Value:
The matrix 'N' with the basis for the null space, or an empty
vector if the matrix 'M' is square and of maximal rank.
-----------------------------------------------
(R version 3.1.1 Patched (2014-09-21 r66653) -- "Sock it to Me")
Georgi
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
