Dear Torstein, nstep_path=0 produces a "strange behavior" as NEB starts counting at 1. So if you just set nstep_path=1 it should work.<br><br>bests<br><br>Layla<br><br><div class="gmail_quote">2012/1/16 Torstein Fjermestad <span dir="ltr"><<a href="mailto:torstein.fjermestad@kjemi.uio.no">torstein.fjermestad@kjemi.uio.no</a>></span><br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear all,<br>
<br>
I have recently made several attempts to submit a NEB calculation using Quantum Espresso version 4.3.<br>
Unfortunately, every attempt fails with the program printing NaN values instead of the Cartesian coordinates for some of the initial images. For instance, in the .path file corresponding to the attached input file, image 3 and 4 (num_of_images=5) consists entirely of NaN values instead of real Cartesian coordinates. Of cause, if some of the initial images consist only of NaN values the calculation has no chance of continuing.<br>
<br>
There have been significant changes in the way to submit a NEB calculation between version 4.2.1 and version 4.3, and to test whether the same behavior would occur in version 4.2.1, I submitted a NEB calculation with QE version 4.2.1 with exactly the same input structures. In that case the program had no problem in generating the initial images. Because of this I think we can exclude the possibility of the error being caused by the input coordinates themselves.<br>
<br>
In the script I used to submit the calculation, the line to run the neb.x executable is the following:<br>
<br>
mpirun -np 16 -npernode 8 neb.x -inp neb_11.inp > neb_11.out<br>
<br>
<br>
Have any of you come across a similar problem before?<br>
Does anyone have suggestions on how to prevent the NaN values from appearing?<br>
<br>
Thanks in advance.<br>
<br>
Yours sincerely<span class="HOEnZb"><font color="#888888"><br>
<br>
Torstein Fjermestad<br>
University of Oslo,<br>
Norway.<br>
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