[Wien] mstar: Error: dM is not finite

[Laurence Marks]

Obviously the line should be something like
dM = p2*dE/(dE*dE+1D-16)

---
Professor Laurence Marks
Department of Materials Science and Engineering
Northwestern University
www.numis.northwestern.edu
"Research is to see what everybody else has seen, and to think what nobody
else has thought" Albert Szent-Györgyi

On Sun, Dec 5, 2021, 7:23 PM Gavin Abo <gabo13279 at gmail.com> wrote:

> According to the README.md at [1], read_mommat_pij.f90 has to be modified
> for WIEN2k 19.1.  Did you do that?  If you didn't do that it might explain
> why your dEij(n,k) and dEij(m,k) values are both zero.
>
> In the mstar.f90 source code (from lines 422 and 423) [2], you can see
> that dE needs to be non-zero to have a computed value for dM.  If dE is
> zero then it causes a divide by zero [3] that is an incomputable computer
> mathematical operation such that dM would be undefined (which is why the "Error:
> dM is not finite").
>
> line 422: dE = -dEij(n,k)/2 -dEij(m,k)/2
> line 423: dM = p2/dE
> [1] https://github.com/rubel75/mstar
> <https://urldefense.com/v3/__https://github.com/rubel75/mstar__;!!Dq0X2DkFhyF93HkjWTBQKhk!A1M4TMzDqdChWXiSrMbJ6jpLdUmIOs0RXkqPT-_6ags-PpPXOBVrkJMCVKaWO_6TYYaogQ$>
> [2] https://github.com/rubel75/mstar/blob/master/mstar.f90
> <https://urldefense.com/v3/__https://github.com/rubel75/mstar/blob/master/mstar.f90__;!!Dq0X2DkFhyF93HkjWTBQKhk!A1M4TMzDqdChWXiSrMbJ6jpLdUmIOs0RXkqPT-_6ags-PpPXOBVrkJMCVKaWO_66qkrE4g$>
> [3] https://www.math.utah.edu/~pa/math/0by0.html
> <https://urldefense.com/v3/__https://www.math.utah.edu/*pa/math/0by0.html__;fg!!Dq0X2DkFhyF93HkjWTBQKhk!A1M4TMzDqdChWXiSrMbJ6jpLdUmIOs0RXkqPT-_6ags-PpPXOBVrkJMCVKaWO_5w-17Opg$>
>
> On 12/5/2021 1:30 AM, Dr. K. C. Bhamu wrote:
>
> Dear Prof. Oleg,
> I am running mstar with Wien2k_19.1 with PBE+SO (20000 kpt, rkmax=8, lvns
> =6).
> I am getting ebelow error:
>
>  KP: 1876 bands: 856 progress:  75%
>  KP: 1877 bands: 854 progress:  75%
>  ikpt =                  1878
>  n =                    39
>  k =                    40
>  m =                    39
>  alpha =                     1
>  beta =                     1
>  pij(alpha,n,k) = (-3.6972599E-06,1.5258900E-06)
>  pij(beta,k,m) = (-3.6972599E-06,-1.5258900E-06)
>  pij(beta,n,k) = (-3.6972599E-06,1.5258900E-06)
>  pij(alpha,k,m) = (-3.6972599E-06,-1.5258900E-06)
>  dEij(n,k) =  0.0000000E+00
>  dEij(m,k) =  0.0000000E+00
>  dM =  (-Infinity,NaN)
>  dE =   0.0000000E+00
>  p2 =  (3.1996142E-11,0.0000000E+00)
> Error: dM is not finite
>
> Should I do a fresh calculation with less number of k-points or the error
> is about something else?
> Let me know if I need to share any files.
>
> Thanks and regards
> Bhamu
>
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