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
>
>
>