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On 22/4/2012 10:02 PM, Matthew Knepley wrote:
<blockquote
cite="mid:CAMYG4GnPrZTRyYUBghaEdrGGG9y0r1ArgTGx5RQBS1Yc09Pgew@mail.gmail.com"
type="cite">
<div class="gmail_extra">On Sun, Apr 22, 2012 at 3:55 PM, TAY
wee-beng <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:zonexo@gmail.com" target="_blank">zonexo@gmail.com</a>></span>
wrote:<br>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Hi, <br>
<br>
I changed the vs2008 and linux source code to
VecView(x,PETSC_VIEWER_STDOUT_WORLD,ierr) but the results
for both outputs are 0 and 0.0416667 (except for one value
which is 0.0833333) respectively.</div>
</blockquote>
<div><br>
</div>
<div>It looks to me like there is a bug in KSPSetUp().
The DMKSPGetContext() is returning a null struct,</div>
<div>so the RHS is never formed, and the Mat is formed by the
default call to DMComputeJacobian. What</div>
<div>is intended here with KSPDM?</div>
</div>
</div>
</blockquote>
Hi，<br>
<br>
So is there a way to fix the bug? What can be done to get it
working? Is this the only fortran example which solve the laplacian
equation using multigrid ?<br>
<br>
Thanks!<br>
<blockquote
cite="mid:CAMYG4GnPrZTRyYUBghaEdrGGG9y0r1ArgTGx5RQBS1Yc09Pgew@mail.gmail.com"
type="cite">
<div class="gmail_extra">
<div class="gmail_quote">
<div><br>
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<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
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Yours sincerely,
<pre cols="72">TAY wee-beng</pre>
<br>
On 22/4/2012 9:35 PM, Jed Brown wrote:
<blockquote type="cite">
<div class="gmail_quote">On Sun, Apr 22, 2012 at 14:30,
TAY wee-beng <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:zonexo@gmail.com" target="_blank">zonexo@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">Sorry for the
mistake. I tried again, changing to "call
VecView(x,0,ierr)"<br>
<br>
but still got the same error:</div>
</blockquote>
</div>
<br>
<div>0 has the wrong type. Use
VecView(x,PETSC_VIEWER_STDOUT_WORLD,ierr)</div>
</blockquote>
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</blockquote>
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<div><br>
</div>
-- <br>
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to
which their experiments lead.<br>
-- Norbert Wiener<br>
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