"Undefined variable "py" or class" when trying to load Python from MATLAB R2014b?

Undefined variable "py" or class when trying to load Python from MATLAB R2014b?

This error message can occur when you are trying to use Python functions in MATLAB R2014b. There are a few things that you can check to troubleshoot this issue:

Check for Python Installation

Ensure that Python is properly installed on your system. You can verify this by typing python --version in the command prompt. If you do not have Python installed, you can download it from the Python website.

Verify Version Compatibility

Make sure that you are using compatible versions of MATLAB and Python. MATLAB R2014b is compatible with Python versions 2.7 and 3.4. If you are using a different version of Python, you may need to update or downgrade your installation.

Configure MATLAB to Find Python

MATLAB needs to know where Python is installed in order to use it. You can set this up by adding the Python installation directory to the MATLAB path. To do this, follow these steps:

1. Open the MATLAB command window.
2. Type the following command: setenv('PYTHON_HOME', 'path_to_python_installation')
3. Replace path_to_python_installation with the actual path to your Python installation.
4. Restart MATLAB.

Add Python Module to Search Path

If you are trying to use a specific Python module, you may need to add it to the Python search path. This can be done by setting the PYTHONPATH environment variable. To do this, follow these steps:

1. Open the MATLAB command window.
2. Type the following command: setenv('PYTHONPATH', 'path_to_python_module')
3. Replace path_to_python_module with the actual path to the Python module.
4. Restart MATLAB.

Check for Module Name Conflicts

Make sure that the Python module you are trying to use does not have the same name as a built-in MATLAB function. If there is a conflict, you will need to use a different name for the Python module.

Inspect Python Tries to Execute Command

If the Python module is trying to execute a command in the wrong module, you will need to modify the code to ensure that the command is executed in the correct module.

Conclusion

By following the steps outlined above, you can troubleshoot the error "Undefined variable "py" or class" when trying to load Python from MATLAB R2014b. If you are still having problems, you can refer to the MathWorks tutorial on this topic or ask for help on the MathWorks support forum.