<div dir="ltr"><div dir="ltr">On Thu, Jan 10, 2019 at 4:30 PM Offermans Willem <<a href="mailto:willem.offermans@vito.be">willem.offermans@vito.be</a>> wrote:</div><div dir="ltr"><br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;"><div><div> 2 Sym. Ops., with inversion, found ( 1 have fractional translation) </div>[...] What does it mean?</div></div></blockquote><div><br></div><div>it means that the symmetry operation consists in a rotation (or a rotation + spatial inversion) plus a translation (not a lattice one)<br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;"><div>
<div>At some point in the sequence of calculations, the output contained the following message about symmetry:</div>
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<div> No symmetry found</div>
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<div>I was surprised about the lost of symmetry. Is it related to the fractional translation?</div></div></div></blockquote><div><br></div><div>no, unless this happens in the last scf step, in which the FFT grid may change, in which case this is what may happen:</div><div><br></div><div style="overflow-wrap: break-word;"> (note: 1 additional sym.ops. were found but ignored
<div> their fractional translations are incommensurate with FFT grid)</div><div>Paolo<br clear="all"></div></div></div>-- <br><div dir="ltr" class="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>