<div dir="ltr"><div><div>Once the error is detected, the code stops immediately and prints nothing useful. Where do you see that there are no cell parameters? And when: during a variable-cell calculation, or also (or only) in a fixed-cell one? If I remember correctly, cell parameters are reprinted on putput at each step in the former case, never in the latter.<br><br></div>Unfortunately the code performing the various MD and structural optimizations is rather obscure and it is not straightforward to figure out how to modify it.<br><br></div><div>Paolo<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Sep 22, 2016 at 2:56 PM, Alaska Subedi <span dir="ltr"><<a href="mailto:asubedi@gmail.com" target="_blank">asubedi@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Paolo,<br>
<br>
Sorry to resurrect this after a long time.<br>
<br>
This problem is innocuous but annoying nonetheless. I am using QE to<br>
relax structures generated by USPEX. For around five percent of the<br>
structures, I get this error. When this error happens, pw.x exits by<br>
only printing atomic positions but not the cell parameters. This gives<br>
problems to USPEX.<br>
<br>
I tried to find which call to output_tau is responsible for this, to<br>
no avail. I'd greatly appreciate if someone can point me to a<br>
modification that will make the code output both the cell_parameters<br>
and atomic_positions during exit after this error.<br>
<br>
Thanks,<br>
Alaska<br>
<br>
<br>
<br>
On Mon, Sep 22, 2014 at 9:52 PM, Paolo Giannozzi<br>
<<a href="mailto:paolo.giannozzi@uniud.it">paolo.giannozzi@uniud.it</a>> wrote:<br>
> This kind of errors invariably happens when you are very close<br>
> to the minimum and you have some numerical noise on forces. It<br>
> is useless in my opinion to insist: your system is sufficiently<br>
> relaxed<br>
><br>
> Paolo<br>
><br>
> On Mon, 2014-09-22 at 13:29 +0530, amitharani wrote:<br>
>> Hi<br>
>> I am getting an error { Error in routine bfgs (1): dE0s is positive<br>
>> which should never happen }. The output file is attached for your kind<br>
>> perusal.This is the 2nd time I am getting the same error consecutively.<br>
>> I followed what Nick had suggested on the pwforum to take the relaxed<br>
>> co-ordinates, make a new input file and resubmit, but it didn't<br>
>> work.Thanks.<br>
>><br>
>><br>
>> ______________________________<wbr>_________________<br>
>> Pw_forum mailing list<br>
>> <a href="mailto:Pw_forum@pwscf.org">Pw_forum@pwscf.org</a><br>
>> <a href="http://pwscf.org/mailman/listinfo/pw_forum" rel="noreferrer" target="_blank">http://pwscf.org/mailman/<wbr>listinfo/pw_forum</a><br>
><br>
> --<br>
> Paolo Giannozzi, Dept. Chemistry&Physics&Environment,<br>
> Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
> Phone <a href="tel:%2B39-0432-558216" value="+390432558216">+39-0432-558216</a>, fax <a href="tel:%2B39-0432-558222" value="+390432558222">+39-0432-558222</a><br>
><br>
> ______________________________<wbr>_________________<br>
> Pw_forum mailing list<br>
> <a href="mailto:Pw_forum@pwscf.org">Pw_forum@pwscf.org</a><br>
> <a href="http://pwscf.org/mailman/listinfo/pw_forum" rel="noreferrer" target="_blank">http://pwscf.org/mailman/<wbr>listinfo/pw_forum</a><br>
______________________________<wbr>_________________<br>
Pw_forum mailing list<br>
<a href="mailto:Pw_forum@pwscf.org">Pw_forum@pwscf.org</a><br>
<a href="http://pwscf.org/mailman/listinfo/pw_forum" rel="noreferrer" target="_blank">http://pwscf.org/mailman/<wbr>listinfo/pw_forum</a><br>
</blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,<br>Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>Phone +39-0432-558216, fax +39-0432-558222<br><br></div></div></div></div></div>
</div>