[R-sig-Geo] spautolm

[Roger Bivand]

On Tue, 13 Jul 2010, Edzer Pebesma wrote:

> spautolm gives me the following warning (from Matrix):
>
>> sres1=spautolm(formula = <omitted>, listw=colw, family = "SAR", method
> = "Matrix")
> Warning message:
> In determinant(x, TRUE) : This version of the Matrix package returns
> |determinant(L)| instead of determinant(A), i.e., a
> *DIFFERENT* value.
> If still necessary, do change your code, following
> http://matrix.r-forge.r-project.org
>
> Is this something I should worry about?
>

No, if you check with a different sparse method, say "LU" or "spam", 
you'll get the same result as with "Matrix". The log determinant code was 
changed before the change was made in Matrix, conditioning on the version 
of Matrix being used, at and following line 269 in:

https://r-forge.r-project.org/scm/viewvc.php/pkg/R/jacobian.R?annotate=282&root=spdep

The warning is still issued once per session by Matrix in case some 
developer hasn't noticed.

Hope this helps,

Roger

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no