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

[Stefano Zampini]

On Fri, Oct 14, 2022, 19:46 Peng Sun <psun at outlook.com> wrote:

> Hi Stefano,
>
> No I used pip to install petsc4py after I installed PETSc.  I did not see
> the binding folder under /src
>


Not sure which was the first version petsc4py was shipped with PETSc , for
sure 3.18 has it.


Best regards,
> Peng Sun
> ------------------------------
> *From:* Stefano Zampini <stefano.zampini at gmail.com>
> *Sent:* Friday, October 14, 2022 4:36 AM
> *To:* Peng Sun <psun at outlook.com>
> *Cc:* Zhang, Hong <hongzhang at anl.gov>; petsc-users at mcs.anl.gov <
> petsc-users at mcs.anl.gov>
> *Subject:* Re: [petsc-users] Issue with single precision complex numbers
> in petsc4py
>
>
>
> 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/
> > <configure.log>
>
>
>
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