postpic-error.py

postpic/postpic/_field_calc.py in kspace_Ex(self, **kwargs)
    196             fields['By'] = self.By()
    197 
--> 198         return self._kspace('Ex', fields, **kwargs)
    199 
    200     def kspace_Ey(self, **kwargs):

postpic/postpic/_field_calc.py in _kspace(self, component, fields, alignment, solver, **kwargs)
    183 
    184         if alignment == 'epoch':
--> 185             return helper.kspace_epoch_like(component, fields, dt, align_to='B', **kwargs)
    186 
    187         if alignment == 'epoch-final':

postpic/postpic/helper.py in kspace_epoch_like(component, fields, dt, extent, omega_func, align_to)
    536     #     print(k, v.extent, [(a[0], a[-1]) for a in v._conjugate_grid().values()])
    537 
--> 538     return kspace(component, fields, interpolation='fourier')
    539 
    540 

postpic/postpic/helper.py in kspace(component, fields, extent, interpolation, omega_func)
    721             if interpolation == 'fourier':
    722                 # print('apply linear phase')
--> 723                 field = field._apply_linear_phase(dict(enumerate(grid_shift)))
    724 
    725             # add the field to the result with the appropriate prefactor

postpic/postpic/datahandling.py in _apply_linear_phase(self, dx)
   1647                              "have transformed_axes_origins not None")
   1648 
-> 1649         exp_ikdx = helper.linear_phase(self, dx)
   1650 
   1651         ret = self * exp_ikdx

postpic/postpic/helper.py in linear_phase(field, dx)
    744         if transform_state is True:
    745             # center the axes around 0 to eliminate global phase
--> 746             axes[i] -= axes[i][gridlen//2]
    747         else:
    748             # start the axes at 0 to eliminate global phase

IndexError: index 0 is out of bounds for axis 0 with size 0