Why am I getting 'MatlabExecutionError: Too many output arguments.' when using the Matlab engine in Python?

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Richard McEver
Richard McEver 2015 年 7 月 1 日
回答済み: Khaoula Mosbahi 2021 年 8 月 9 日
Here is the code I am running on each side:
>>> m1 = matlab.engine.start_matlab()
>>> testpath = 'Path/to/file/containing-testfunc.m'
>>> m1.addpath(testpath)
*lots of path gibberish*
>>> m1.testfunc()
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "/Library/Python/2.7/site-packages/matlab/engine/matlabengine.py"
, line 79, in __call__
File "/Library/Python/2.7/site-packages/matlab/engine/futureresult.py"
, line 107, in result
self._future,self._nargout, None, out=self._out, err=self._err)
MatlabExecutionError: Too many output arguments.
I have double checked the path to testfunc.m, and I suspect that Matlab is able to find it because otherwise it would say it could not find it.
Here are the contents of testfunc.m:
function [] = testfunc()
a = 2
As indicated by the name, this function is only a test because I found this error using a more complicated function. I created the testfunc() just to try to narrow down the reasons for which I might be getting this error. I am able to run testfunc() (and my more complicated function) from the Matlab gui if I use
>>> m1.desktop(nargout=0)
>> testfunc()
a =
This leads me to believe there is an issue with the Matlab engine or the way I am using it.
It might be important to point out that built in Matlab functions seem to be working fine in the engine for example:
m1.workspace['testvar'] = 10
I am only having trouble using functions that I include myself.
Any help would be greatly appreciated.
  4 件のコメント
Nagabhushan SN
Nagabhushan SN 2020 年 4 月 20 日
Thanks! very useful. Is it possible to upvote a comment here? Like in SO



Bo Li
Bo Li 2015 年 7 月 1 日
Try this:
By default, the nargout is set to 1 in Python Engine:
Since testfunc.m does not return any result, you need to specify nargout to be 0 like what you did to launch the MATLAB Desktop:

その他の回答 (1 件)

Khaoula Mosbahi
Khaoula Mosbahi 2021 年 8 月 9 日
hello everyone , i need your help , when i run matlab code en matlab i found this result
but when i try this code:
eng = matlab.engine.start_matlab()
kh=eng.Main(7, nargout=0)
the result always NONE
help please

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