<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">Dear Davide,</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Thanks for replying,</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">I'm working with systems with more than 100 electrons. The systems have 130 or more carbon atoms, it's expensive to me increase the number of k-points. I need optimize the computational cost, do you have a hint in this case?</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Thanks a lot,</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Alan.</div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-09-22 7:15 GMT-03:00 Davide Ceresoli <span dir="ltr"><<a href="mailto:davide.ceresoli@cnr.it" target="_blank">davide.ceresoli@cnr.it</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Alan,<br>
I would try to reach an absolute error of the order of<br>
0.001 on the f-sum rule, for systems up to ~100 electrons.<br>
I never investigated whether an absolute or relative error<br>
is the right choice.<br>
<br>
Best regards,<br>
Davide<br>
<div><div class="h5"><br>
<br>
<br>
On 09/21/2017 07:41 PM, Ambrozio wrote:<br>
> Hi dear users and developers,<br>
><br>
> I have a question regarding the chemical shielding convergence using Gipaw. As<br>
> the best of my knowledge, the f-sum rule parameter is an indicative of the<br>
> convergence, corresponding to the number of valence electrons. I use a criterion<br>
> of 0.01 for the absolute error in the f-sum rule tensor principal components.<br>
> I'd like to know if this criterion is correct? I mean ... should I take the<br>
> absolute error ? or the relative one?<br>
><br>
> Regards,<br>
><br>
> Alan,<br>
><br>
> Federal University of Espirito Santo, Vitoria, Brazil.<br>
><br>
> --<br>
><br>
> Alan J. Romanel Ambrozio<br>
> Bacharel em Física<br>
> Mestre em Eng. de Materiais<br>
> Doutorando em Física - PPGFis<br>
><br>
><br>
<br>
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