[petsc-users] Issue with single precision complex numbers in petsc4py

[Stefano Zampini]

> On Oct 14, 2022, at 3:53 AM, Peng Sun <psun at outlook.com> wrote:
> 
> Hi Hong,
> 
> Thanks for the advice.  I could not install petsc4py with the --with-petsc4py=1 option, which gave me an "No rule to make target 'petsc4py-install'" error when I ran "make install".   That was why I needed to install petsc4py separately after the PETSc was installed.


After you installed PETSc, go to src/binding/petsc4py and run make install there. It will install in .local and it will be visible to python.
Is this how you installed it? 
> 
> Best regards,
> Peng Sun
> From: Zhang, Hong <hongzhang at anl.gov>
> Sent: Thursday, October 13, 2022 4:30 PM
> To: Peng Sun <psun at outlook.com>
> Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
> Subject: Re: [petsc-users] Issue with single precision complex numbers in petsc4py
>  
> It seems that you installed petsc4py separately. I would suggest to add the configure option --with-petsc4py=1 and follow the instructions to set PYTHONPATH before using petsc4py.
> 
> Hong (Mr.)
> 
> > On Oct 13, 2022, at 10:42 AM, Peng Sun <psun at outlook.com> wrote:
> > 
> > Hi Matt,
> > 
> > Sure, please see the attached configure.log file.  Thanks!
> > 
> > Best regards,
> > Peng Sun
> > 
> > 
> > From: Matthew Knepley <knepley at gmail.com>
> > Sent: Thursday, October 13, 2022 6:34 AM
> > To: Peng Sun <psun at outlook.com>
> > Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
> > Subject: Re: [petsc-users] Issue with single precision complex numbers in petsc4py
> >  
> > First send configure.log so we can see the setup.
> > 
> >   Thanks,
> > 
> >       Matt
> > 
> > On Thu, Oct 13, 2022 at 12:53 AM Peng Sun <psun at outlook.com> wrote:
> > Dear PETSc community, 
> > 
> > I have a question regarding the single precision complex numbers of petsc4py.  I configured PETSc with the “--with-scalar-type=complex --with-precision=single" option before compiling, but all the DA structures I created with petsc4py had double precision.  
> > 
> > Here is a minimum test code on Python 3.8/PETSc 3.12/petsc4py 3.12: both print commands show data type of complex128.  Could anybody please help me?  Thanks!
> > 
> > import
> >  petsc4py
> > 
> > import
> >  sys
> > petsc4py.init(sys.argv)
> > 
> > from petsc4py import
> >  PETSc
> > 
> > da=PETSc.DA().create(sizes=[
> > 2,2,2],dof=1,stencil_type=0,stencil_width=1,boundary_type=1
> > )
> > da_1 = da.createGlobalVec()
> > 
> > print
> > (petsc4py.PETSc.ComplexType)
> > 
> > print(da_1.getArray().dtype)
> > 
> > 
> > 
> > Best regards,
> > Peng Sun
> > 
> > 
> > -- 
> > What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> > -- Norbert Wiener
> > 
> > https://www.cse.buffalo.edu/~knepley/ <https://www.cse.buffalo.edu/~knepley/>
> > <configure.log>

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