Add the possibility to plot scalar signal

Author: GiulioRomualdi

robot_log_visualizer/plotter/matplotlib_viewer_canvas.py

@@ -76,7 +76,12 @@ def update_plots(self, paths, legends):
                 data = self.signal_provider.data
                 for key in path[:-1]:
                     data = data[key]
-                datapoints = data["data"][:, int(path[-1])]
+                try:
+                    datapoints = data["data"][:, int(path[-1])]
+                except IndexError:
+                    # This happens in the case the variable is a scalar.
+                    datapoints = data["data"][:]
+
                 timestamps = data["timestamps"] - self.signal_provider.initial_time
 
                 (self.active_paths[path_string],) = self.axes.plot(

robot_log_visualizer/ui/gui.py

@@ -335,7 +335,11 @@ def __populate_variable_tree_widget(self, obj, parent) -> QTreeWidgetItem:
             return parent
         if "data" in obj.keys() and "timestamps" in obj.keys():
             temp_array = obj["data"]
-            n_cols = temp_array.shape[1]
+            try:
+                n_cols = temp_array.shape[1]
+            except IndexError:
+                # This happens in the case the variable is a scalar.
+                n_cols = 1
 
             # In yarp telemetry v0.4.0 the elements_names was saved.
             if "elements_names" in obj.keys():