Re: equifrequency contour of the second band.

You apparently didn't specify a k range that includes the solution in 
find-k.

Honestly, to make isofrequency plots it is much easier to just supply a 
grid of k-points (filling the Brillouin zone) to (run), rather than using 
find-k.  Then you just plot the grid of frequencies in some contour 
plotting program (e.g. with Matlab's "contour" command).

Regards,
Steven G. Johnson

On Fri, 18 Jan 2008, Youri Bae wrote:

> Hello,
>
> I would like to plot equifrequency contour of the second band. I can
> successfully plot equifrequency contour of the first band, but it's always
> returns like the following message:
>
> ERROR: failed to bracket the root in find-root-deriv
>
> Thank you.
>
> Youri
>