
<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">What do you mean by 'breaks convergence'? Are you sure your matrices are symmetric?<br class="">Jose<br class=""></div></blockquote><br class=""></div><div>I shall clarify that the calculated by <span style="font-family: Monaco; font-size: 11px;" class="">EPSComputeResidualNorm </span>residual norm </div>is bigger than the required tolerance, set by EPSSetTolerances. <div class=""><br class=""></div><div class="">In light of your latest answer about B-norms, </div><div class="">supposedly this is a wrong approach. <br class=""><div class=""><br class=""></div><div class="">Sorry for being un-precise initially.</div><div class=""><br class=""></div><div class="">Regards,</div><div class="">Denis.</div></div></body></html>