<div dir="ltr"><div>Please verify how far from convergence the BFGS procedure is. If it is very close, as I suspect, there is no point in insisting.<br><br></div>Paolo<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Nov 14, 2016 at 4:54 PM, janardhan H.L. <span dir="ltr"><<a href="mailto:janardhanhl@yahoo.com" target="_blank">janardhanhl@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:13px"><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr">Dear Respected forum members,</div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218"><br></div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr">While relaxing the slab with 'cg' diagonalization method, I have encountered this error (Error in routine bfgs (1): NR step-length unreasonably short). In bfgs_module.f90 it says the following,</div><table style="box-sizing:border-box;border-spacing:0px;border-collapse:collapse;color:rgb(51,51,51);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";font-size:14px" id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_13685"><tbody style="box-sizing:border-box" id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_13686"><tr style="box-sizing:border-box" id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_13687"><td style="box-sizing:border-box;padding-right:10px;padding-left:10px;line-height:20px;vertical-align:top;overflow:visible;word-wrap:normal" id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_13688"><font id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_13945" face="Consolas, Liberation Mono, Menlo, Courier, monospace"><span style="font-size:12px;white-space:pre-wrap" id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_13946"> IF ( nr_step_length < eps16 ) &
CALL errore( 'bfgs', 'NR step-length unreasonably short', 1 )</span></font><br id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_13947"></td></tr></tbody></table><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr"><br></div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr"> In the forum mail archive, this error has not been mentioned. kindly let me know what would be the possible reasons for this error? <br></div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr">Thanks and regards</div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr"><br></div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr">Janardhan </div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr">Korea Institue of Science and Technology </div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr">Seoul, S.Korea</div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr"><br></div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218" dir="ltr"><br></div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218"><br></div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218"><br></div><div id="m_1895443232145733055yui_3_16_0_ym19_1_1479135657490_10218"> </div></div></div><br>______________________________<wbr>_________________<br>
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