<div dir="ltr">Please send me an output showing the problem you mention. Paolo<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Sep 23, 2016 at 11:31 AM, 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"><span class="">On Thu, Sep 22, 2016 at 6:03 PM, Paolo Giannozzi <<a href="mailto:p.giannozzi@gmail.com">p.giannozzi@gmail.com</a>> wrote:<br>
> Once the error is detected, the code stops immediately and prints nothing<br>
> useful. Where do you see that there are no cell parameters? And when: during<br>
> a variable-cell calculation, or also (or only) in a fixed-cell one? If I<br>
> remember correctly, cell parameters are reprinted on putput at each step in<br>
> the former case, never in the latter.<br>
<br>
</span>In a vc-relax calculation, the code prints atomic_positions but not<br>
cell_parameters after this error. Generally, vc-relax prints both<br>
cell_parameters and atomic_positions. But this does not happen when<br>
the code stops with this error. It would be nice if it also printed<br>
cell_parameters before exiting.<br>
<br>
Thanks,<br>
Alaska<br>
<div class="HOEnZb"><div class="h5"><br>
<br>
><br>
> Unfortunately the code performing the various MD and structural<br>
> optimizations is rather obscure and it is not straightforward to figure out<br>
> how to modify it.<br>
><br>
> Paolo<br>
><br>
> On Thu, Sep 22, 2016 at 2:56 PM, Alaska Subedi <<a href="mailto:asubedi@gmail.com">asubedi@gmail.com</a>> wrote:<br>
>><br>
>> 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>
><br>
><br>
><br>
><br>
> --<br>
> Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,<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>
><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>
</div></div></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>