<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear Nick, <div class=""><br class=""></div><div class="">ON_THE_FLY_LOC is the implementation of the following paper: </div><div class=""><a href="https://aip.scitation.org/doi/full/10.1063/1.2828507" class="">https://aip.scitation.org/doi/full/10.1063/1.2828507</a></div><div class="">In the spirit of previous works of Thomas, Iftimie and Tuckerman, </div><div class="">the orbital coefficient matrix of sought to be localized on-the-fly </div><div class="">during the simulation. Contrary to the density matrix P, C is much </div><div class="">more compact (MxN vs. MxM) but less sparse. This does not </div><div class="">improve the stability/numerical stability, I would even argue quite </div><div class="">the contrary. It’s one step towards efficient linear-scaling. In the </div><div class="">limit of the corresponding localized orbitals MAY be equivalent to </div><div class="">MLWF, but I conjecture in a numerical calculation there should be </div><div class="">differences. </div><div class="">To my understanding there is no specific reason for the combination </div><div class="">with IRAC, except for that this had been implemented by the very </div><div class="">same persons around the very same time: </div><div class=""><a href="https://aip.scitation.org/doi/full/10.1063/1.2841077" class="">https://aip.scitation.org/doi/full/10.1063/1.2841077</a></div><div class=""><br class=""></div><div class="">Cheers, </div><div class="">Thomas<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">Am 03.11.2021 um 00:21 schrieb Nicholas Winner <<a href="mailto:nwinner@berkeley.edu" class="">nwinner@berkeley.edu</a>>:</div><br class="Apple-interchange-newline"><div class="">Would anybody well versed in CP2K be able to provide a brief explanation of the ON_THE_FLY_LOC keyword, found inside the OT section. <div class=""><br class=""></div><div class="">It says that it performs on the fly localization of the MOs, but nothing more. Does it help with convergence and/or numerical stability? It is also listed as only being compatible with the IRAC method, rather than the strict orthogonality algorithm.</div><div class=""><br class=""></div><div class="">Any explanation would be appreciated.</div><div class=""><br class=""></div><div class="">Best,</div><div class="">-Nick</div><div class=""><br class="webkit-block-placeholder"></div>
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Kühne</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: 2;" class="">Dynamics of Condensed Matter</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: 2;" class="">Chair of Theoretical Chemistry</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: 2;" class="">University of Paderborn</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: 2;" class="">Warburger Str. 100</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: 2;" class="">D-33098 Paderborn</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: 2;" class="">Germany</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: 2;" class=""><a href="mailto:thomas.kuehne@upb.de" class="">thomas.kuehne@upb.de</a></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-position: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: 2; widows: 2;" class="">+49/(0)5251/60-5726</div></div></div></div></div>
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