[Pw_forum] what negative omiga means ?

[陳 少華]

I see ,thank you very much.

max
--- degironc <degironc at sissa.it> 說：

> when omega^2 is negative the code prints -
> sqrt(abs(omega^2))
> stefano
> 
> 陳 少華 wrote:
> 
> >Dear members,
> >I have a little question bothering me.After I
> >calculated the phonon dispersion. I got some
> negative
> >omiga values.
> >As I know ,image omiga means unstable.But what
> >negative omiga means ? I suppose it should be
> positive
> >value,if it is stable system.
> >
> >Best Regards
> >max
> >
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