Example 003_profiling/02_double_slit.py fails in v.2.10.0-pre1

[cverstege]

Example 003_profiling/02_double_slit.py is failing with the latest pre-release after moving the derivation to numdifftools:

Traceback:

Traceback (most recent call last):
  File "/home/cedric/Projekte/kafe2/examples/003_profiling/02_double_slit.py", line 120, in <module>
    p.plot(asymmetric_parameter_errors=True)
    ~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/cedric/Projekte/kafe2/kafe2/fit/_base/plot.py", line 1344, in plot
    _plot_results = self._plot_and_get_results(plot_indices=(i,) if self._separate_figs else None)
  File "/home/cedric/Projekte/kafe2/kafe2/fit/_base/plot.py", line 832, in _plot_and_get_results
    _artist = _pdc.call_plot_method(_pt, target_axes=self._get_axes(_axes_key), **_plot_kwargs)
  File "/home/cedric/Projekte/kafe2/kafe2/fit/_base/plot.py", line 361, in call_plot_method
    return _callable(target_axes=target_axes, **kwargs)
  File "/home/cedric/Projekte/kafe2/kafe2/fit/xy/plot.py", line 169, in plot_model_error_band
    _band_y = self.y_error_band
              ^^^^^^^^^^^^^^^^^
  File "/home/cedric/Projekte/kafe2/kafe2/fit/xy/plot.py", line 117, in y_error_band
    return self._fit.error_band(self.model_line_x)
           ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/home/cedric/Projekte/kafe2/kafe2/fit/xy/fit.py", line 741, in error_band
    _f_deriv_by_params = self.eval_model_function_derivative_by_parameters(x=x)
  File "/home/cedric/Projekte/kafe2/kafe2/fit/xy/fit.py", line 723, in eval_model_function_derivative_by_parameters
    return self._param_model.eval_model_function_derivative_by_parameters(x=x, model_parameters=model_parameters, par_dx=par_dx)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/cedric/Projekte/kafe2/kafe2/fit/xy/model.py", line 141, in eval_model_function_derivative_by_parameters
    _ret[_par_idx] = _first_derivative(_par_val)
                     ~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/home/cedric/Projekte/kafe2/venv/lib64/python3.13/site-packages/numdifftools/core.py", line 288, in __call__
    results, f_xi = self._derivative(x_i, args, kwds)
                    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/home/cedric/Projekte/kafe2/venv/lib64/python3.13/site-packages/numdifftools/core.py", line 242, in _derivative_nonzero_order
    return self.fd_rule.apply(results, steps, step_ratio), fxi
           ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/cedric/Projekte/kafe2/venv/lib64/python3.13/site-packages/numdifftools/finite_difference.py", line 583, in apply
    f_del, h, original_shape = self._vstack(sequence, steps)
                               ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/home/cedric/Projekte/kafe2/venv/lib64/python3.13/site-packages/numdifftools/finite_difference.py", line 563, in _vstack
    original_shape = np.shape(sequence[0])
                              ~~~~~~~~^^^
IndexError: list index out of range

[JohannesGaessler]

Thank you, I forgot to check the examples. The problem is that the step size for fixed parameters was 0, should be fixed now.