Re: Bug when dividing a scalar by a vector?

[John W. Eaton]

On 01/12/2017 10:42 AM, Sebastian Schöps wrote:
> Montgomery-Smith, Stephen wrote
> > My guess is that it is solving the underdetermined equation:
> >
> > x1+x2+x3+x4=1.
> >
> > So both solutions are correct answers.  There are infinitely many correct
> > answers.
> >
> > If I had to choose, I guess I would go for the answer who square sum is
> > minimized, which would favor Octave's answer.
>
> Thanks! That explains the behaviour and I agree that both solutions do make
> sense. However, is that documented somewhere? Shouldn't there be a warning?
> Similar to the case when a singular linear equation system is solved?

For which cases do you want warnings?

Do you want a warning because the particular solution is different from 
Matlab, or because the system is not square?

Does Matlab always warn when solving least-squares problems?

jwe