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

Samuel Lanthaler s.lanthaler at gmail.com
Wed Jan 10 10:11:12 CST 2018

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 

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!

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