[petsc-users] Using SLEPC: Fortran call to NEPNLEIGSSetSingularitiesFunction (similar to SNESSetFunction?)

Samuel Lanthaler s.lanthaler at gmail.com
Wed Jan 10 10:29:04 CST 2018

Ah, I see.
Great, thank you, Jose!


On 01/10/2018 05:23 PM, Jose E. Roman wrote:
> This function is not implemented in Fortran. I will add it and let you know.
> Jose
>> El 10 ene 2018, a las 17:11, Samuel Lanthaler <s.lanthaler at gmail.com> escribió:
>> Hi there,
>> I'm stuck getting a call to the SLEPC routine "NEPNLEIGSSetSingularitiesFunction" to work from within Fortran.
>> To be more precise: To get started with the solution of a non-linear eigenvalue-problem, I am first trying to write a Fortran version of slepc-3.8.1/.../nep/examples/tutorials/ex27.c, and then use it as a template for my own code. But I haven't gotten far...
>> Let me attach the source of the current state of my attempt to translate ex27.c to Fortran code. When trying to compile the attached source, my compiler complains:
>> nleigs.o: In function `MAIN__':
>> nleigs.f90:(.text+0x213): undefined reference to `nepnleigssetsingularitiesfunction_'
>> Does someone maybe see what I'm doing wrong? Do I maybe need to add a USE statement in addition to
>> USE slepcsys
>> USE slepcnep
>> ?
>> I'm quite confused about the C++ pointers and how to deal with them when calling C++ functions from Fortran, so I don't really understand what's going on here. I will greatly appreciate your help!
>> Thanks,
>> Samuel
>> <nleigs.f90>

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