Hi all,today i am calculating a lot of regression parameter, where theinverse of a triangular matrix is involved.(Normally the inverse is not needed, but this is another issue)I observe that sometimes/manytimes the builtin inv failed to returnthe inverse matrix. Does anybody has experience with this function?Regards,Kim
Any chance your matrix is singular?
On 22 Feb., 05:14, Aaron Davies <aaron.dav…> wrote:
> Any chance your matrix is singular?
Might be the case. But the point is that .qml.minv returns the inverse
where inv just returns 0h. I will try to generate/ or find an example
where inv fails to return a matrix.
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> On Monday, February 21, 2011, kuentang <kuent…> wrote:
>
> > Hi all,
>
> > today i am calculating a lot of regression parameter, where the
> > inverse of a triangular matrix is involved.
> > (Normally the inverse is not needed, but this is another issue)
>
> > I observe that sometimes/manytimes the builtin inv failed to return
> > the inverse matrix. Does anybody has experience with this function?
>
> > Regards,
> > Kim
>
> > –
> >
Submitted via Google Groups</kuent…></aaron.dav…>