[Pw_forum] ph.x max_irr_dim

[Eyvaz Isaev]

Hi  Vasile,

I am aware of this error. It comes from phcom.f90. You
can increase max_irr_dim parameter and the recompile
PH. The parameter defines maximum allowed number of
degeneracy of modes. Fore some reason you have more
than 4-fold degenerate modes. max_irr_dim=4 is
accepted by default.

Bests,
Eyvaz.


--- Vasile Chis <cvasse at fy.chalmers.se> wrote:

> Hi,
> 
> I have a problem with ph.x.......when I try to
> calculate phonons at a 
> q-point near Gamma, I get the following message:
> 
>      task #         8
>      from set_irr : error #         0
>      npert > max_irr_dim
> 
> And I also got it once at the Gamma point
> calculation of the phonons.
> I'm using the latest version of the pw-scf code.
> 
> I have searched the pw-forum, but I haven't seen
> anyone else with this 
> problem.
> 
> I thank you for your replies.
> 
> -- 
> __________________________________
>   Vasile Chis
>   Interface Modelling Group
>   Department of Physics
>   Göteborgs Universitet
> __________________________________
> 
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