[Matlab in python] Does matlab engine supports a .m file whose input is a function handle?

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Sungha Cho
Sungha Cho 2019-6-21
回答： Mike Croucher 2024-1-24
Hi all, I want to use matlab.engine to run .m file.
To make an easy explanation, lets assume I have my_fun.m file with
function res = my_fun(f)
res = f(0)
end
Here f is (or could be) a function hadle like
f = @(x) sin(x)
Now to run this file in python, I should run
import matlab.engine
eng = matlab.engine.start_matlab()
eng.my_fun(nargout=1)
Of course, this code returns an 'lack-of-input' error. How do I input a function handle f into the third line of the code?
Moreover, I ultimately want to do the following:
Is there a way to input a 'python function' like
import numpy as np
def f(x):
return np.sin(x)
?

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回答（1 个）

Mike Croucher
Mike Croucher 2024-1-24
Unfortunately, the MATLAB Engine for python does not support passing Python functions to MATLAB. Running the following in Python:
import matlab.engine
eng = matlab.engine.start_matlab()
import numpy as np
def f(x):
return np.sin(x)
eng.my_fun(f)
gives
---------------------------------------------------------------------------TypeError Traceback (most recent call last) Cell In[11], line 1----> 1 eng.my_fun(f)File ~\AppData\Local\Programs\Python\Python310\lib\site-packages\matlab\engine\matlabengine.py:64, in MatlabFunc.__call__(self, *args, **kwargs) 61 _stderr_info = '{0}.{1}'.format(_stderr.__class__.__module__, _stderr.__class__.__name__); 62 raise TypeError(pythonengine.getMessage('StderrMustBeStringIO', _sIO_info, _stderr_info)) ---> 64 future = pythonengine.evaluateFunction(self._engine()._matlab, 65 self._name, nargs,args, 66 out=_stdout, err=_stderr) 67 if background: 68 return FutureResult(self._engine(), future, nargs, _stdout, _stderr, feval=True)
TypeError: unsupported Python data type: function
So, we are unable to get a Python function from Python into MATLAB. Even if we could, we'd need to do something different in my_fun.m I think.
I'll raise this as a feature request with development. Can I ask why you need to do this please? Having a solid application can help set priorities.

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