@@ -338,3 +338,7 @@ Changes in Kwant 1.4.1

   low-level systems.

 - A note about an :ref:`whatsnew13-params-api-change` that ocurred in Kwant

   1.3 was added.

+

+Changes in Kwant 1.4.2

+----------------------

+- Minor bugfixes of the KPM module and qsymm integration.

@@ -47,7 +47,7 @@ def make_system(R):

 def main():

     syst = make_system(100)

-    print(kwant.smatrix(syst, 1.1, [0.1]).transmission(0, 1))

+    print(kwant.smatrix(syst, 1.1, params=dict(B=0.1)).transmission(0, 1))

 if __name__ == '__main__':

@@ -16,7 +16,9 @@ class Lead:

         self.t = t

         self.potential = potential

-    def selfenergy(self, fermi_energy, args=()):

+    def selfenergy(self, fermi_energy, args=(), params=None):

+        assert not args

+        assert params is None

         return square_selfenergy(self.width, self.t,

                                  self.potential + fermi_energy)

@@ -73,8 +75,10 @@ class System(kwant.system.FiniteSystem):

         self.leads = [Lead(shape[1], hopping, lead_potentials[i])

                       for i in range(2)]

-    def hamiltonian(self, i, j):

+    def hamiltonian(self, i, j, *args, params=None):

         """Return an submatrix of the tight-binding Hamiltonian."""

+        assert not args

+        assert params is None

         if i == j:

             # An on-site Hamiltonian has been requested.

             result = 4 * self.t + self.pot(self.pos_from_nodeid(i))

@@ -180,7 +180,11 @@ def sympify(expr, locals=None):

                 "identifiers and may not be keywords".format(repr(k)))

     # sympify values of locals before updating it with extra_ns

-    locals = {k: sympify(v) for k, v in locals.items()}

+    # Cast numpy array values in locals to sympy matrices to make sure they have

+    # correct format

+    locals = {k: (sympy.Matrix(v) if isinstance(v, np.ndarray) else sympify(v))

+              for k, v in locals.items()}

+

     for k, v in extra_ns.items():

         locals.setdefault(k, v)

     try:

@@ -381,18 +381,13 @@ def search_mumps():

     libmumps-scotch-dev and the MUMPS binaries in the conda-forge channel."""

     lib_sets = [

         # Debian

-        ['zmumps_scotch', 'mumps_common_scotch', 'mpiseq_scotch'],

+        ['zmumps_scotch', 'mumps_common_scotch', 'mpiseq_scotch',

+         'pord', 'gfortran'],

         # Conda (via conda-forge).

-        # TODO: remove dependency libs (scotch, metis...) when conda-forge

-        # packaged mumps/scotch are built as properly linked shared libs

-        # 'openblas' provides Lapack and BLAS symbols

-        ['zmumps', 'mumps_common', 'metis', 'esmumps', 'scotch',

-         'scotcherr', 'mpiseq', 'openblas'],

+        ['zmumps_seq', 'mumps_common_seq'],

     ]

-    common_libs = ['pord', 'gfortran']

-

     for libs in lib_sets:

-        found_libs = search_libs(libs + common_libs)

+        found_libs = search_libs(libs)

         if found_libs:

             return found_libs

     return []