AttributeError: module 'dolfin' has no attribute 'SLEPcEigenSolver'

installation
1

Dear fenics community,

I am trying to use SLEPcEigenSolver but I get an error

AttributeError: module ‘dolfin’ has no attribute ‘SLEPcEigenSolver’

For example, running these python commands I get (I show below version of PETSc4py and SLEPc4py and DOLFIN)

Python 3.8.14 (default, Sep 16 2022, 11:07:26) 
[GCC 10.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import dolfin as dl
>>> dl.SLEPcEigenSolver
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'dolfin' has no attribute 'SLEPcEigenSolver'
>>> dl.__version__
'2019.1.0'
>>> import slepc4py
>>> slepc4py.__version__
'3.15.2'
>>> import petsc4py
>>> petsc4py.__version__
'3.15.5'

Any ideas on how to solve this is really appropriated. Many thanks!

2

How have you installed DOLFIN? SLEPc is an optional dependency. If you compiled it from source it likely didn’t find your SLEPc installation.

3

Thank you @nate for your help. I did not install DOLFIN myself, I am using it in a cluster where it is already packaged in a module. I then use

module load <module_name>

to have it installed in my environment.

4

I would check with your cluster administration to see if DOLFIN was configured and compiled with SLEPc.

1 Like
5

Thank you @nate for the help! I will try that.