Thanks, Matt. Let me make sure, so<div><span class="Apple-style-span" style="color: rgb(80, 0, 80); font-family: arial, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255); ">Dirichlet BC on the left boundary --> u[i= 0][] = constant </span><div>
<font class="Apple-style-span" color="#500050" face="arial, sans-serif"><span class="Apple-style-span" style="font-size: 13px; background-color: rgb(255, 255, 255); ">Neumann BC on the right boundary --> u[i=16][]-u[i=15][])/dx = </span></font><span class="Apple-style-span" style="color: rgb(80, 0, 80); font-family: arial, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255); ">constant </span></div>
<div><font class="Apple-style-span" color="#500050" face="arial, sans-serif"><span class="Apple-style-span" style="color: rgb(0, 0, 0); font-family: arial; ">is that correct?</span></font></div><div><font class="Apple-style-span" color="#500050" face="arial, sans-serif"><span class="Apple-style-span" style="color: rgb(0, 0, 0); font-family: arial; "><br>
</span></font></div><div><font class="Apple-style-span" color="#500050" face="arial, sans-serif"><span class="Apple-style-span" style="color: rgb(0, 0, 0); font-family: arial; ">best,</span></font></div><div><font class="Apple-style-span" color="#500050" face="arial, sans-serif"><span class="Apple-style-span" style="color: rgb(0, 0, 0); font-family: arial; ">Alan</span></font></div>
<div><div class="gmail_quote"><br></div><div class="gmail_quote"><br></div><div class="gmail_quote">On Fri, Sep 2, 2011 at 10:20 AM, Jed Brown <span dir="ltr"><<a href="mailto:jedbrown@mcs.anl.gov">jedbrown@mcs.anl.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im"><div class="gmail_quote">On Fri, Sep 2, 2011 at 09:20, Alan Wei <span dir="ltr"><<a href="mailto:zhenglun.wei@gmail.com" target="_blank">zhenglun.wei@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I thought there is a ghosted grid around Dirichlet and Neumann BC's.</blockquote></div><br></div><div>Only if you ask for it with DMDA_BOUNDARY_GHOSTED (not available in petsc-3.1). This example does not.</div>
</blockquote></div><br></div></div>