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<DIV><FONT color=#0000ff size=3 face=Verdana>thanks,</FONT></DIV>
<DIV><FONT color=#0000ff size=3></FONT> </DIV>
<DIV><FONT color=#0000ff size=3>but I don't understand <FONT color=#000000
size=2>VecGetArray(), <FONT color=#0000ff>that is to say, I don't know how to
call VecGetArray() </FONT></FONT></FONT></DIV>
<DIV><FONT size=3><FONT color=#0000ff size=2></FONT></FONT> </DIV>
<DIV><FONT size=3><FONT color=#0000ff size=2>when I plan to get any local values
of x, </FONT></FONT></DIV>
<DIV><FONT color=#0000ff></FONT> </DIV>
<DIV><FONT color=#0000ff>Maybe,</FONT></DIV>
<DIV><FONT color=#0000ff></FONT> </DIV>
<DIV><FONT color=#ff0000>double precision u(n)</FONT></DIV>
<DIV><FONT color=#ff0000></FONT> </DIV>
<DIV><FONT color=#ff0000>Vec x</FONT></DIV>
<DIV><FONT color=#ff0000></FONT> </DIV>
<DIV><FONT color=#ff0000>PetscOffset uu_i</FONT></DIV>
<DIV><FONT color=#ff0000></FONT> </DIV>
<DIV><FONT color=#ff0000>call VecGetArray(x,u,uu_i,ierr)</FONT></DIV>
<DIV><FONT color=#0000ff></FONT> </DIV>
<DIV><FONT color=#0000ff>is it right? </FONT></DIV>
<DIV><FONT color=#0000ff></FONT> </DIV>
<DIV><FONT color=#0000ff>it seems don't work. how can I call
it?</FONT></DIV>
<DIV><FONT face=Verdana></FONT><FONT color=#0000ff size=3></FONT> </DIV>
<DIV>
<DIV>
<DIV align=left>
<DIV align=left><FONT color=#0000ff size=2
face=宋体></FONT></DIV></DIV></DIV></DIV>
<DIV>thanks,</DIV>
<DIV> </DIV>
<DIV>leping</DIV>
<DIV>
<HR color=#b5c4df SIZE=1>
</DIV>
<DIV><FONT size=2 face=Verdana><STRONG>发件人：</STRONG> Matthew Knepley
</FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>发送时间：</STRONG> 2010-04-16 22:48:18
</FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>收件人：</STRONG> chenleping; PETSc users
list </FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>抄送：</STRONG> </FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>主题：</STRONG> Re: [petsc-users] array and
vec </FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT> </DIV>
<DIV><FONT size=2 face=Verdana>2010/4/15 陈乐平（Leping Chen） <SPAN dir=ltr><<A
href="mailto:chenleping@yahoo.cn">chenleping@yahoo.cn</A>></SPAN><BR>
<DIV class=gmail_quote>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV style="MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">
<DIV><FONT color=#0000ff size=3 face=Verdana>hello, petsc teams,</FONT></DIV>
<DIV><FONT color=#0000ff size=3></FONT> </DIV>
<DIV><FONT color=#0000ff size=3>when I use FormFuncion(), I need use a value
of x;</FONT></DIV>
<DIV><FONT color=#0000ff size=3></FONT> </DIV>
<DIV><FONT color=#0000ff size=3>but x is defined by Vec, I don't know how to
get a value of x, for example, the 3rd
value.</FONT></DIV></DIV></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV>Exactly as Jed wrote, you can use VecGetArray() to access any local
values</DIV>
<DIV>of x.</DIV>
<DIV><BR></DIV>
<DIV> Matt</DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV style="MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">
<DIV><FONT color=#0000ff size=3><SPAN
style="COLOR: rgb(0,0,0); FONT-SIZE: 13px"
class=Apple-style-span></SPAN></FONT> </DIV>
<DIV><FONT face=Verdana></FONT><FONT color=#0000ff size=3>thanks,</FONT></DIV>
<DIV><FONT color=#0000ff size=3></FONT> </DIV>
<DIV><FONT color=#0000ff size=3>leping</FONT></DIV>
<DIV><FONT color=#0000ff size=3 face=Verdana> <SPAN>
<DIV></DIV></SPAN></FONT>
<HR color=#b5c4df SIZE=1>
</DIV></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>发件人：</STRONG> Jed Brown </FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>发送时间：</STRONG> 2010-04-16
21:21:47 </FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>收件人：</STRONG> chenleping; PETSc users
list </FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>抄送：</STRONG> </FONT></DIV>
<DIV><FONT size=2 face=Verdana><STRONG>主题：</STRONG> Re: [petsc-users] array
and vec </FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT></DIV>
<DIV><FONT size=2 face=Verdana>
<DIV>On Thu, 15 Apr 2010 21:17:19 +0800, "=?gb2312?B?s8LA1sa9?=" <<A
href="mailto:chenleping@yahoo.cn"
target=_blank>chenleping@yahoo.cn</A>> wrote:</DIV>
<DIV>> petsc teams,</DIV>
<DIV>> </DIV>
<DIV>> for following definitions:</DIV>
<DIV>> </DIV>
<DIV>> double precision u(n)</DIV>
<DIV>> Vec v</DIV>
<DIV>> </DIV>
<DIV>> then, how can I actualize mutual updating between u(n) and v?</DIV>
<DIV></DIV>
<DIV>I'm not sure what you mean, if these are the same quantity then they</DIV>
<DIV>shouldn't be stored in separate locations. See VecGetArray:</DIV>
<DIV></DIV>
<DIV> <A
href="http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Vec/VecGetArray.html"
target=_blank>http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Vec/VecGetArray.html</A></DIV>
<DIV></DIV>
<DIV>Jed</DIV></FONT></DIV></BLOCKQUOTE></DIV><BR><BR clear=all><BR>-- <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></FONT></DIV></BODY></HTML>