The examples in those old slides might be outdated. Try with the examples that come with the PETSc repo or tarball. In particular, that example can be found in src/binding/petsc4py/demo/legacy/bratu2d/bratu2d.py.
Jose > El 25 oct 2024, a las 19:58, Vaishak Prasad <vaishakpra...@gmail.com> > escribió: > > Dear All, > Greetings from India. > > I am new to petsc4py. I was trying out the example on slides 18, and 19 at > > https://urldefense.us/v3/__https://www.bu.edu/pasi/files/2011/01/Lisandro-Dalcin-petsc4py.pdf__;!!G_uCfscf7eWS!dpUYbX5YRxvaN33h0mhRCxEMkia_yIdGU6sQOpV0upkfReAJkPC8H6GX4HH6NNvgOCt1F2Ogn2963Ff_Vkub5yK7$ > > > However, I get a zero vector for the solution `x`. > > I am using petsc4py 3.21.3 on Linux. > > Any help would be appreciated. > > With regards > > -- > Vaishak Prasad > Post Doctoral Fellow > Astrophysical Relativity Group > International Center for Theoretical Sciences > Tata Institute of Fundamental Research > Survey No. 151, Shivakote, Hesaraghatta Hobli, > Bengaluru, Karnataka, India, > Earth, Solar system, > Milky Way Galaxy, The Local Group
