error output from python matlab engine

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Jeremy Rutman 2016-1-13

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https://ww2.mathworks.cn/matlabcentral/answers/263616-error-output-from-python-matlab-engine

评论： Jeremy Rutman 2016-1-27

I'd like to get better debug info than the 'matlab function cannot be evaluated' that I currently see from a complex matlab function being run from python using the python matlab engine. Is there some way to pipe extra matlab debug output to a file and/or get more info ?

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Stephen23 2016-1-13

编辑：Stephen23 2016-1-13

The documentation

http://www.mathworks.com/help/matlab/matlab_external/troubleshoot-matlab-errors-in-python.html

states that you should get the whole MATLAB error message from the Python Engine: "When a MATLAB® function raises an error, the MATLAB Engine for Python® stops the function and catches the exception raised by MATLAB. The engine copies the error message to a new Python exception. The engine raises the Python exception."

That page gives several examples of this.

What other information would you like?

Jeremy Rutman 2016-1-27

在 MATLAB Online 中打开

pretty much anything beyond 'matlab function cannot be evaluated' would be great - i've been using

      out = StringIO.StringIO()
      err = StringIO.StringIO()
      retvals = matlab_engine.myfunc(image_filename, nargout=3,stdout=out,stderr=err)
   outstring = out.getvalue()
    errstring = err.getvalue()
    logging.debug('ml output:'+str(outstring)+'\n')
    logging.debug('ml err output:'+str(errstring)+'\n')

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Answer 1

Robert Snoeberger 2016-1-15

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/263616-error-output-from-python-matlab-engine#answer_206291

在 MATLAB Online 中打开

You could get the last uncaught exception [1] and then call getReport [2] to get the error message for that exception.

Example

>>> import matlab.engine
>>> eng = matlab.engine.start_matlab()
>>>
>>> # Do something that throws an exception...
>>>
>>> eng.eval('exception = MException.last;', nargout=0)
>>> eng.eval('getReport(exception)')