<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif">Hi,</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif">
Yes they are equivalent.</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif">No need to shift the k-mesh.</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif">
<br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif">Regards,</div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr">__________________________________<br><div>Iyad Al-Qasir, PhD</div>
<div>Assistant Professor</div><div><br></div><div>Department of Nuclear Engineering</div><div>University of Sharjah</div><div>Sharjah, UAE</div></div></div>
<br><br><div class="gmail_quote">On Wed, Mar 12, 2014 at 6:09 PM, yelena <span dir="ltr"><<a href="mailto:yelena@ipb.ac.rs" target="_blank">yelena@ipb.ac.rs</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Is<br>
ATOMIC_POSITIONS {crystal}<br>
-0.000054104 -0.000054104 0.002714087<br>
0.666666666 -0.000054104 0.002714087<br>
0.333387437 0.333387437 0.002714087<br>
0.666666666 0.333387437 0.002714087<br>
-0.000054104 0.666666666 0.002714087<br>
0.333387437 0.666666666 0.002714087<br>
<br>
equivalent to:<br>
<br>
0.999945896 0.999945896 0.002714087<br>
1.666666666 0.999945896 0.002714087<br>
1.333387437 1.333387437 0.002714087<br>
1.666666666 1.333387437 0.002714087<br>
0.999945896 1.666666666 0.002714087<br>
1.333387437 1.666666666 0.002714087<br>
<br>
Should my K points and q points grid be shifted now, like<br>
<br>
K_POINTS AUTOMATIC<br>
16 16 1 1 1 0<br>
<br>
<br>
<br>
Thank you all for always being helpful.<br>
Best,<br>
J.<br>
<div class="HOEnZb"><div class="h5"><br>
On 12 Mar 2014 13:01, yelena wrote:<br>
> Hello everyone!<br>
> I have kind a silly question but I can't figure it out. So I<br>
> apologize<br>
> in advance, if I'm asking stupid things.<br>
> I have structure I want to relax and then do electron-phonon<br>
> calculation. But after relaxation I get negative coordinates and that<br>
> (I<br>
> think cause) some really small negative frequencies in elph<br>
> files...and<br>
> that leads to NaN lambda and Tc after lambda.x I tried same<br>
> coordinates<br>
> but larger q grid and same thing happens. When I remove negative<br>
> signs<br>
> from coordinates manually, negative frequencies do not appear and I<br>
> get<br>
> lambda and Tc and everything is ok (but of course, that's not correct<br>
> way to do it)<br>
> So is there any trick I could do to fix this problem? how not to get<br>
> minus sign for coordinates when performing relax scf?<br>
> Best regards,<br>
> Jelena Pesic,<br>
> PhD Student, Center for Solid State Physics and New Materials,<br>
> IPB Serbia<br>
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