Problem of Call User Script from Python

Thanks everyone!

I installed matlab engine for python successfully and I was able to call matlab functions from python. This is the link I followed: http://www.mathworks.com/help/matlab/matlab-engine-for-python.html

I tried to call matlab script in python. However I cannot run the script. I followed the instruction in this link: http://www.mathworks.com/help/matlab/matlab_external/call-user-script-and-function-from-python.html

And I get this error information:

%run "C:\Users\czhan139\Documents\PhD research\Experiments & Data Processing\python_learning\test.py" --------------------------------------------------------------------------- MatlabExecutionError Traceback (most recent call last) C:\Users\czhan139\Documents\PhD research\Experiments & Data Processing\python_learning\test.py in module() 1 import matlab.engine 2 eng = matlab.engine.start_matlab() ----> 3 eng.triarea(nargout=0)

C:\Users\czhan139\AppData\Local\Enthought\Canopy\User\lib\site-packages\matlab\engine\matlabengine.pyc in _call_(self, *args, **kwargs) 78 else: 79 return FutureResult(self._engine(), future, nargs, _stdout, ---> 80 _stderr).result() 81 82

C:\Users\czhan139\AppData\Local\Enthought\Canopy\User\lib\site-packages\matlab\engine\futureresult.pyc in result(self, timeout) 107 108 self._result = pythonengine.getFEvalResult( --> 109 self._future,self._nargout, None, out=self._out, err=self._err) 110 self._retrieved = True 111 return self._result

MatlabExecutionError: Undefined function or variable 'triarea'.

Undefined function or variable 'triarea'.

It seems the path of the file is wrong. Then I use cd command to set the path of the .m file and the .py file (they are in the same folder) in matlab. Then I tried again. Still not working!

Sorry for the poor English. Is there anyone who has run the matlab script successfully?

Thank you.

Answer 1

[Bo Li]

The error message indicates that MATLAB cannot find a variable called 'triarea' or a M function named with 'triarea.m'.

Assume your 'triarea.m' is located in folder 'c:\foo', what is the output of following commands?

>>>eng.cd(r'c:\foo', nargout=0)
>>>eng.ls(nargout=0)

[Cheng Zhang]

Thank you! I add these two lines in my code and it works!

[Paul Wódz]

I'been trying for hours run a method on an engine instance, which was initialized in python script in a different directory than the matlab script. The cd command fixed this issue for me. Thanks!

[Arthur dos Santos]

Dude, I love you. It works, thank you.