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Hi Miguel,
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<div class="">Thank you for the nice work. I do not understand what you propose to do here. What is the obstacle to using current TSSetIJacobianP() for the corner case you mentioned? Are you considering a case in which the mass matrix is parameterized, e.g.
M(p) udot - f(t,u) = g(t,u) ?</div>
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<div class="">Thanks,</div>
<div class="">Hong
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<div class="">On Dec 17, 2020, at 3:38 PM, Salazar De Troya, Miguel via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov" class="">petsc-users@mcs.anl.gov</a>> wrote:</div>
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<span lang="ES" style="font-size: 11pt;" class="">Hello,<o:p class=""></o:p></span></div>
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<span lang="ES" style="font-size: 11pt;" class=""><o:p class=""> </o:p></span></div>
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<span style="font-size: 11pt;" class="">I am working on hooking up TSAdjoint with pyadjoint through the firedrake-ts interface (<a href="https://github.com/IvanYashchuk/firedrake-ts" style="color: rgb(5, 99, 193); text-decoration: underline;" class="">https://github.com/IvanYashchuk/firedrake-ts</a>).
I have done most of the implementation and now I am just testing for corner cases. One of them is when the design variable is multiplying the first derivative term. It would be the case of</span><span style="font-size: 11pt;" class="">F(Udot,U,P,t) = G(U,P,t)
in<span class="Apple-converted-space"> </span><a href="https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/Sensitivity/TSSetIJacobianP.html" style="color: rgb(5, 99, 193); text-decoration: underline;" class="">https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/Sensitivity/TSSetIJacobianP.html</a><span class="Apple-converted-space"> </span>.
I imagine that one could think of refactoring the “P” in the left hand side to the right hand side, but this is not trivial when “P” is a discontinuous field over the domain. I think it would be better to include the case of F(Udot,U,P,t) = G(U,P,t) in TSSetIJacobianP
and I am volunteering to do it. Given the current implementation of TSAdjoint, is this something feasible?<o:p class=""></o:p></span></div>
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<span style="font-size: 11pt;" class=""><o:p class=""> </o:p></span></div>
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<span style="font-size: 11pt;" class="">Thanks<o:p class=""></o:p></span></div>
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<span style="font-size: 11pt;" class="">Miguel<o:p class=""></o:p></span></div>
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<span style="font-size: 11pt;" class=""><o:p class=""> </o:p></span></div>
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<span lang="ES" style="font-size: 9pt; font-family: Consolas;" class="">Miguel A. Salazar de Troya</span><span lang="ES" style="font-size: 10.5pt;" class=""><o:p class=""></o:p></span></div>
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<span style="font-size: 9pt; font-family: Consolas;" class="">Postdoctoral Researcher, Lawrence Livermore National Laboratory</span><span style="font-size: 10.5pt;" class=""><o:p class=""></o:p></span></div>
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<span style="font-size: 9pt; font-family: Consolas;" class="">B141</span><span style="font-size: 10.5pt;" class=""><o:p class=""></o:p></span></div>
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<span style="font-size: 9pt; font-family: Consolas;" class="">Rm: 1085-5</span><span style="font-size: 10.5pt;" class=""><o:p class=""></o:p></span></div>
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<span style="font-size: 9pt; font-family: Consolas;" class="">Ph: 1(925) 422-6411</span></div>
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