[petsc-users] Binary format in real vs. complex scalar type configurations

[Pierre Jolivet]

Hello Frederico,
I’m not sure that’s possible.
Here is what I do, it makes me sick, but mixing precisions/scalar types with PETSc is difficult (crossing my fingers this will be better with future).
In MATLAB (after putting petsc/share/petsc/matlab in the path):
A = PetscBinaryRead('your_binary_mat_with_re+im.dat','complex',true); % scalar-type=complex
PetscBinaryWrite('re.dat',real(A)); % scalar-type=real
PetscBinaryWrite('im.dat',imag(A)); % scalar-type=real

Thanks,
Pierre

> On 11 May 2021, at 3:30 PM, Frederico Teixeira <teixeira at zmt.swiss> wrote:
> 
> Dear fellows,
> 
> I hope this message finds you safe and well.
> 
> I have a complex-valued matrix and its real/imaginary components in binary format. They were extracted from a solver that only works with "scalar-type=complex" configuration.
> I am getting weird results when I load them into a small test program that's configured with "scalar-type=real", but I believe this is expected.
> At the end of the day, I would like to have both real and imaginary components as real-valued matrices.
> Is it possible to do it? I want to test preconditioners that are tailored for this sort of problem.
> 
> Regards,
>  Frederico.
> 

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