<p dir="ltr">Vincent also wrote me directly. I'm forwarding my answer.<br></p>
<p dir="ltr">Vincent,<br></p>
<p dir="ltr">to my knowledge there are two cases when this can happen<br></p>
<p dir="ltr">A) you specify indices (in local numbering) which are not lie on the interface</p>
<p dir="ltr">B) you specify indices (in local numbering) which are on a part of the interface shared by 2 subregions only<br></p>
<p dir="ltr">Note that A) is a natural requirement, whether B) is a bug in the current release.</p>
<p dir="ltr">If you are in situation B), than you can either use 'master' where th ebug has been already fixed or (and this is the case if you are also using SLEPc), to simply comment lines 125, 127, 182 and 187 (4 lines in total) of src/ksp/pc/bddc/bddcgraph.c. This should solve your problem.<br></p>
<p dir="ltr">Sorry for slow reply</p>
<p dir="ltr">Stefano </p>
<div class="gmail_quote">Il 15/ott/2014 22:04 "Jed Brown" <<a href="mailto:jed@jedbrown.org">jed@jedbrown.org</a>> ha scritto:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">"De Groof, Vincent Frans Maria" <<a href="mailto:Vincent.De-Groof@uibk.ac.at">Vincent.De-Groof@uibk.ac.at</a>> writes:<br>
> I want to add a few primal vertices to the bddc preconditioner. But<br>
> when checking the coarse space (using pc_bddc_check_level 1), nothing<br>
> changes. Is there some special sequence that needs to be followed to<br>
> add vertices?<br>
<br>
Stefano, can you answer this?<br>
</blockquote></div>