Problem of Call User Script from Python

Question

Cheng Zhang 2015-4-13

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/202901-problem-of-call-user-script-from-python

评论： Arthur dos Santos 2021-12-14

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.

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Answer 1

Bo Li 2015-4-13

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/202901-problem-of-call-user-script-from-python#answer_175109

在 MATLAB Online 中打开

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)

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Paul Wódz 2016-7-18

编辑：Paul Wódz 2016-7-18

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 2021-12-14