Why matlab crashes when I try to use a numpy Python package? (2019a)

Question

Rubem Pacelli 2020-2-4

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503505-why-matlab-crashes-when-i-try-to-use-a-numpy-python-package-2019a

评论： Pierre Loicq 2021-4-7

采纳的回答： Rubem Pacelli

在 MATLAB Online 中打开

I'm trying to use Python on Matlab, but the system crashes everytime I try to use a Numpy Package.

My only step was to switch the pyversion to match with anaconda executable version (I'm on Linux):

pyversion
       version: '3.7'
    executable: '/home/rubem/anaconda3/bin/python'
       library: '/home/rubem/anaconda3/lib/libpython3.7m.so'
          home: '/home/rubem/anaconda3'
      isloaded: 0

If a type something like:

py.importlib.import_module('numpy')

or:

py.numpy.limspace(0,10,101)

Matlab crashes. In the Terminal, the following command appear:

      malloc(): memory corruption
/usr/local/bin/matlab: line 3:  1874 Segmentation fault      sudo /usr/local/Polyspace/R2019a/bin/matlab

Despite the lack of documentation on Matlab, I tried to find out what the hell was going on and I found out two interesting things:

1 - I followed the example in https://www.mathworks.com/help/matlab/matlab_external/call-user-defined-custom-module.html and it's works. So I Think that just the numpy package has the problem

2 - If I type

py.sys.path

I recieve:

ans = 
  Python list with no properties.
    ['', '/home/rubem/anaconda3/lib/python37.zip', '/home/rubem/anaconda3/lib/python3.7', '/home/rubem/anaconda3/lib/python3.7/lib-dynload', '/home/rubem/anaconda3/lib/python3.7/site-packages']

That's weird because the second one isn't a path folder (python37 is a .zip-file that doesn't exist). Unfortunately, I don't know how I can change this.

3 - "isloaded" is equal to zero when the matlab initialize. I don't know neither how I set this logical variable nor what is this does (I swear for god I searched, but the documentation on Matlab is very poor yet).

How can I solve this problem?

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Answer 1

Rubem Pacelli 2020-3-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503505-why-matlab-crashes-when-i-try-to-use-a-numpy-python-package-2019a#answer_420798

I think the problem was my program. I switched to 2018b and it seems to work.

btw, I think its more useful to close this post because the problem wasn't technical questions.

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Pierre Loicq 2021-4-7

I resolved the exact same problem on Matlab 2016b with this one : https://fr.mathworks.com/matlabcentral/answers/358233-matlab-python-interface-broken

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Answer 2

Hiro Yoshino 2020-2-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503505-why-matlab-crashes-when-i-try-to-use-a-numpy-python-package-2019a#answer_413640

This might be useful:

https://jp.mathworks.com/matlabcentral/answers/410406-import-numpy-to-matlab

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Hiro Yoshino 2020-2-5

This might be helpful:

https://www.youtube.com/watch?v=y7NBT6O0fJU

Rubem Pacelli 2020-2-5

在 MATLAB Online 中打开

Hiro Yoshino, i saw all yours links.

1 - The command "pyenv" seems don't exist on 2019a.

Undefined function or variable 'pyenv'

2 - According to what I read: "MATLAB automatically selects and loads a Python version when you type a Python command, such as: py.funcname" . I did it. I created a silly .py-function called "my_python_function.py" and I call it from matlab. It's work because I don't use numpy package. Then, I typed pyversion and I recieve:

version: '3.7'
    executable: '/home/rubem/anaconda3/bin/python'
       library: '/home/rubem/anaconda3/lib/libpython3.7m.so'
          home: '/home/rubem/anaconda3'
      isloaded: 1

however, If I type then

py.importlib.import_module('numpy')

My matlab crashes anyway :(

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