<div dir="ltr">Barry,<div><br></div><div>Is the method exact if I have a time dependent mass matrix (dF/dU_t changes each time step)? I'm not sure it's possible if TSSetIJacobian expects a function which computes the combination of dF/dU and a*dF/dU_t. But, perhaps there is something I'm missing.</div><div><br></div><div>Otherwise, it looks very comprehensive. I like how you added the "cost integrand". If I recall correctly, the Trilinos package Rythmos is missing this.</div><div><br></div><div>Thanks!</div><div><br></div><div>Dave</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Apr 14, 2015 at 8:30 AM, Barry Smith <span dir="ltr"><<a href="mailto:bsmith@mcs.anl.gov" target="_blank">bsmith@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="HOEnZb"><div class="h5"><br>
> On Apr 14, 2015, at 1:06 AM, Dave Makhija <<a href="mailto:makhijad@colorado.edu">makhijad@colorado.edu</a>> wrote:<br>
><br>
> Hello,<br>
><br>
> I'm evaluating my options for computing time dependent adjoints. I did not think PETSc supported this, but I see "TSAdjointSolve" in the development branch. That would be fantastic news if you plan to support time integrated adjoints!<br>
><br>
> What features are envisioned and when is the targeted release date?<br>
<br>
</div></div> Dave,<br>
<br>
We currently have discrete adjoint computations for explicit RK methods and for implicit theta methods (backward Euler and Crank-Nicholson). The development copy of the users manual has some discussion (<a href="http://www.mcs.anl.gov/petsc/petsc-master/docs/manual.pdf" target="_blank">http://www.mcs.anl.gov/petsc/petsc-master/docs/manual.pdf</a> page 135) and there are several examples. I urge you to try them out now in master and stay in contact with us to insure we provide what you need as we are actively developing them.<br>
We plan a release for early June.<br>
<br>
Barry<br>
<br>
><br>
> Thanks!<br>
><br>
> Dave<br>
<br>
</blockquote></div><br></div>