On Tue, Jul 10, 2012 at 11:03 AM, TAY wee-beng <span dir="ltr"><<a 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">
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<pre cols="72">Yours sincerely,
TAY wee-beng</pre>
On 10/7/2012 2:07 PM, Matthew Knepley wrote:<br>
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<blockquote type="cite">On Tue, Jul 10, 2012 at 5:39 AM, TAY wee-beng <span dir="ltr"><<a href="mailto:zonexo@gmail.com" target="_blank">zonexo@gmail.com</a>></span>
wrote:<br>
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<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 read in the manual in page 50 that it's recommended to
declare struct to represent field for dof > 1 for DM.<br>
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<div>We mean C struct. C makes it easy (just use a pointer type
cast). Fortran makes it hard unfortunately.</div>
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<div>
Matt</div>
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Ok, I'll try to use another mtd. <br>
<br>
Btw, if I declare:<br>
<br>
<i>PetscScalar,pointer :: array2(:,:,:)<br>
<br>
with DMDACreate2d using dof = 2,<br>
<br>
call DMDAVecGetArrayF90(da,x_local,array2,ierr)<br>
<br>
access array2 ....<br>
<br>
call DMDAVecRestoreArrayF90(da,x_local,array2,ierr)</i><br>
<br>
How is the memory for "array2" allocated ? Is it allocated all the
time, or only between the DMDAVecGetArrayF90 and
DMDAVecRestoreArrayF90?<br>
<br>
Also, can I "reuse" array2? For e.g., now for y_local:<br>
<br>
<i>call DMDAVecGetArrayF90(da,y_local,array2,ierr)<br>
<br>
access array2 ....</i>
<i><br>
<br>
call DMDAVecRestoreArrayF90(da,y_local,array2,ierr)</i>
<br></div></blockquote><div><br></div><div>The right thing to do here is to implement DMDAVecGetArratDOFF90().</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Thank you!<br>
<br>
<blockquote type="cite">
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<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> I'm using Fortran and
for testing, I use dof = 1 and write as:<br>
<br>
<i>type field<br>
<br>
</i><i>PetscScalar</i><i> u (or real(8) :: u)<br>
<br>
end type field<br>
<br>
type(field), pointer :: field_u(:,:)</i><br>
<br>
When I tried to use :<br>
<br>
<i>call DMDAVecGetArrayF90(da,x_local,field_u,ierr)</i><br>
<br>
I got the error : There is no matching specific subroutine
for this generic subroutine call. [DMDAVECGETARRAYF90]<br>
<br>
The da, x_local has been defined with the specific DM
routines. It worked if I use :<br>
<br>
<i>PetscScalar,pointer :: array(:,:) and<br>
<br>
call DMDAVecGetArrayF90(da,x_local,array,ierr)</i><br>
<br>
May I know what did I do wrong?<span><font color="#888888"><br>
<br><span class="HOEnZb"><font color="#888888">
<br>
<pre cols="72">--
Yours sincerely,
TAY wee-beng</pre>
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-- <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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<br>
<br>
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</blockquote></div><br><br clear="all"><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>