<div dir="ltr"><div dir="ltr">On Thu, Apr 6, 2023 at 10:21 AM Takahashi, Tadanaga <<a href="mailto:tt73@njit.edu">tt73@njit.edu</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I am following up from the last inquiry. I read the source code <a href="https://petsc.org/release/src/snes/impls/nasm/nasm.c.html" target="_blank">nasm.c</a> and it looks like sub-snes iteration is being initialized with a scatter call from the previous solution. In other words, if I use Newton's method for the local solver, then in each NASM iteration the Newton's method uses the previous local solution as the initial guess. Can anyone confirm this? </div></blockquote><div><br></div><div>This is the intention. There are not many tests, so it is possible there is a bug, but it is supposed to use the existing solution.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Apr 2, 2023 at 6:14 PM Takahashi, Tadanaga <<a href="mailto:tt73@njit.edu" target="_blank">tt73@njit.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello PETSc devs, <div><br></div><div>I am using SNES NASM with Newton LS on the sub-SNES. I was wondering how the sub-SNES chooses the initial guess during each NASM iteration. Is it using the previously computed solution or is it restarting from zero?</div></div>
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</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>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</div><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>