Scenarios/plot network (#262)

* Catch bug in plot_network with 2D arrays

* Add plot_network() to test_io.py

Author: FBumann

flixopt/structure.py

@@ -636,6 +636,8 @@ def describe_numpy_arrays(arr: np.ndarray) -> Union[str, List]:
 
         def normalized_center_of_mass(array: Any) -> float:
             # position in array (0 bis 1 normiert)
+            if array.ndim >= 2:  # No good way to calculate center of mass for 2D arrays
+                return np.nan
             positions = np.linspace(0, 1, len(array))  # weights w_i
             # mass center
             if np.sum(array) == 0:

tests/test_io.py

@@ -28,6 +28,7 @@ def test_flow_system_file_io(flow_system, highs_solver):
     calculation_0 = fx.FullCalculation('IO', flow_system=flow_system)
     calculation_0.do_modeling()
     calculation_0.solve(highs_solver)
+    calculation_0.flow_system.plot_network()
 
     calculation_0.results.to_file()
     paths = CalculationResultsPaths(calculation_0.folder, calculation_0.name)
@@ -36,6 +37,7 @@ def test_flow_system_file_io(flow_system, highs_solver):
     calculation_1 = fx.FullCalculation('Loaded_IO', flow_system=flow_system_1)
     calculation_1.do_modeling()
     calculation_1.solve(highs_solver)
+    calculation_1.flow_system.plot_network()
 
     assert_almost_equal_numeric(
         calculation_0.results.model.objective.value,