On Wed, 1 Sept 2021 at 04:42, BHAVYA BHARDWAJ <bhavya1705@yahoo.com> wrote:
>
> Respected Anton,
>
> Thank you for taking the time to answer my query. Yes you are right, I am using pybinding (https://docs.pybinding.site/en/stable/)  to generate the model and Kwant for calculating the transport characteristics.
>
>
> Thank You,
>
> Regards,
>
> Bhavya Bhardwaj
>
> On Wednesday, 1 September, 2021, 03:20:05 am IST, Anton Akhmerov <anton.akhmerov+kd@gmail.com> wrote:
>
>
> Hi Bhavya,
>
> The error you are seeing is because for some reason the linear system
> you're solving has real inputs. Scattering problems are almost never
> real, and therefore we didn't bother to support this in the code.
> Moreover internally Kwant never produces linear problems that are of
> real data type and not complex. Are you using a different package to
> generate a Kwant problem?
>
> Best,
> Anton
>
> On Sun, 13 Jun 2021 at 22:42, BHAVYA BHARDWAJ <bhavya1705@yahoo.com> wrote:
> >
> > Repected Members,
> >
> > I am a B.Tech Student using Kwant for simulations.
> > Python Version: 3.7.8
> > Kwant Version: 1.4.2
> > Ubuntu 20
> > The Error I faced is given below.
> >
> > AttributeError                            Traceback (most recent call last)
> > <ipython-input-6-c80da766c4bb> in <module>
> >      17    pyplot.ylabel("conductance [e^2/h]")
> >      18    pyplot.show()
> > ---> 19 solving(model.tokwant())
> >
> > <ipython-input-6-c80da766c4bb> in solving(sys)
> >      7        energy = ie * 0.01
> >      8        # compute the scattering matrix at a given energy
> > ----> 9        smatrix = kwant.greens_function(sys, energy,check_hermiticity=False)
> >      10        # compute the transmission probability from lead 0 to
> >      11        # lead 1
> >
> > ~/Downloads/112358/lib/python3.7/site-packages/kwant/_common.py in inner(*args, **kwargs)
> >      70            if sig.bind(*args, **kwargs).arguments.get(parameter_name):
> >      71                warn()
> > ---> 72            return f(*args, **kwargs)
> >      73
> >      74        return inner
> >
> > ~/Downloads/112358/lib/python3.7/site-packages/kwant/solvers/common.py in greens_function(self, sys, energy, args, out_leads, in_leads, check_hermiticity, params)
> >    485        rhs = sp.bmat([[i for i in linsys.rhs if i.shape[1]]],
> >    486                      format=self.rhsformat)
> > --> 487        flhs = self._factorized(linsys.lhs)
> >    488        data = self._solve_linear_sys(flhs, rhs, kept_vars)
> >    489
> >
> > ~/Downloads/112358/lib/python3.7/site-packages/kwant/solvers/mumps.py in _factorized(self, a)
> >    102    def _factorized(self, a):
> >    103        inst = mumps.MUMPSContext()
> > --> 104        inst.factor(a, ordering=self.ordering)
> >    105        return inst
> >    106
> >
> > ~/Downloads/112358/lib/python3.7/site-packages/kwant/linalg/mumps.py in factor(self, a, ordering, ooc, pivot_tol, reuse_analysis, overwrite_a)
> >    318                                                          row, col, data)
> >    319        else:
> > --> 320            self.analyze(a, ordering=ordering, overwrite_a=overwrite_a)
> >    321
> >    322        self.mumps_instance.icntl[22] = 1 if ooc else 0
> >
> > ~/Downloads/112358/lib/python3.7/site-packages/kwant/linalg/mumps.py in analyze(self, a, ordering, overwrite_a)
> >    227
> >    228        if dtype != self.dtype:
> > --> 229            self.mumps_instance = getattr(_mumps, dtype+"mumps")(self.verbose)
> >    230            self.dtype = dtype
> >    231
> >
> > AttributeError: module 'kwant.linalg._mumps' has no attribute 'dmumps'
> >
> >
> > Kindly guide me so I can overcome this error.
> >
> >
> > Thank You,
> >
> > Regards,
> >
> > Bhavya Bhardwaj
> >
> >
> >