Re: [Pw_forum] Pw_forum Digest, Vol 125, Issue 13

2017-12-20 Thread Anuja Chanana
Thanks. Is it possible to read merged two output files in Xcrysden? Looking forward to a reply. Thanks and Regards Dr. Anuja Chanana Research Associate Materials Theory Lab - Prof. Umesh Waghmare Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur

Re: [Pw_forum] Pw_forum Digest, Vol 125, Issue 13

2017-12-20 Thread Lorenzo Paulatto
On 20/12/17 08:58, Anuja Chanana wrote: > Thanks. > Is it possible to read merged two output files in Xcrysden? > Looking forward to a reply. Why don't you try? kind regards -- Lorenzo Paulatto - Paris ___ Pw_forum mailing list Pw_forum@pwscf.org

Re: [Pw_forum] error- dE0s is positive which should never happen

2017-12-20 Thread Saif Ullah
Dear Bhushan, It means that you have already achieved (nearly achieved) the convergence as can be concluded from the following sentence by prof. Paolo (This kind of errors invariably happens when you are very close to the minimum and you have some numerical noise on forces. It is useless in my

[Pw_forum] The influence of mixing_beta in scf calculation and alpha_mixing in phonon calculation

2017-12-20 Thread 黄志硕
Dear all users, When encountering the convergence problems, the most suggested thing is to change the mixing parameters in scf calculation. But I wonder if changing mixing data (mixing_beta in scf calculation, and alpha_mixing in phonon calculation) could influence the accurate of the results,

[Pw_forum] k-mesh vs q-mesh

2017-12-20 Thread A. Jain
Hi All, I have a query regarding selecting the size of q-grids to use when trying to obtain phonon dispersion. Obviously there is a difference between k-mesh and q-mesh as they are used to calculate different properties, as referenced in this thread from 2012:

[Pw_forum] Converged SCF total energies different in 6.0/6.1/6.2

2017-12-20 Thread WF
Dear all, In tests a normal DFT calculations with Si, I noticed that QE 6.0 and 6.1 gives exactly same total energy with 6.0 and 6.1 (-15.75190880 Ry), but with QE 6.2.1, the total energy is -15.75191309Ry. I tested this on two different machines with different compilers, the results are the same