Crash if the dimension of the data in the "log" is 1x1

[davidegorbani]

The robot-log-visualizer crashes if in the log field of the matlab structure generated by the YarpRobotLogger there is a data field of dimension 1x1 such as the one shown in the picture.

The error that I get is the following:

Traceback (most recent call last):
  File "/home/dgorbani/software/robotology-superbuild/build/install/lib/python3/dist-packages/robot_log_visualizer/ui/gui.py", line 627, in open_mat_file
    self.__load_mat_file(file_name)
  File "/home/dgorbani/software/robotology-superbuild/build/install/lib/python3/dist-packages/robot_log_visualizer/ui/gui.py", line 547, in __load_mat_file
    self.signal_provider.open_mat_file(file_name)
  File "/home/dgorbani/software/robotology-superbuild/build/install/lib/python3/dist-packages/robot_log_visualizer/file_reader/signal_provider.py", line 140, in open_mat_file
    self.text_logging_data["log"] = self.__populate_text_logging_data(
  File "/home/dgorbani/software/robotology-superbuild/build/install/lib/python3/dist-packages/robot_log_visualizer/file_reader/signal_provider.py", line 95, in __populate_text_logging_data
    data[key] = self.__populate_text_logging_data(file_object=value)
  File "/home/dgorbani/software/robotology-superbuild/build/install/lib/python3/dist-packages/robot_log_visualizer/file_reader/signal_provider.py", line 95, in __populate_text_logging_data
    data[key] = self.__populate_text_logging_data(file_object=value)
  File "/home/dgorbani/software/robotology-superbuild/build/install/lib/python3/dist-packages/robot_log_visualizer/file_reader/signal_provider.py", line 75, in __populate_text_logging_data
    if text_ref.shape[0] == len(data[key]["timestamps"]):
TypeError: len() of unsized object

I can visualize data of matlab structure in which there is not that data field.

[GiulioRomualdi]

Hi @davidegorbani thank you for reporting! Unfortunately I don't have time to fix it before the next two weeks.

If you want you may open a PR with the fix. In theory it should be enough to catch the exception.

Thank you very much!

[davidegorbani]

Thank you! I will try to solve it as you suggested.

[davidegorbani]

Adding this line of code in the xml file, as suggested by @GiulioRomualdi, solved the problem.

[GiulioRomualdi]

Hi @davidegorbani by any chance do you have a dataset where I can replicate the issue?

[davidegorbani]

Hello @GiulioRomualdi, here is a dataset that I just acquired that replicates the error. Note that in order to acquire this set of data I commented out this line.

dataset.zip

[GiulioRomualdi]

Fixed by https://github.com/ami-iit/robot-log-visualizer/pull/65

[davidegorbani]

Thank you!