How do I call a custom python function from matlab that uses an import statement?

Question

Steven 2017-7-13

3
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/348650-how-do-i-call-a-custom-python-function-from-matlab-that-uses-an-import-statement

回答： Robert Snoeberger 2017-7-17

I have a custom python script called testmat.py with two functions:

# testmat.py
  import numpy
def createarray(n):
    P = numpy.ones(2);
    print(P)
    return P
def createarray2(n):
    P = 2;
    print(P)
    return P
def createarray3():
    P = 3.14;
    print(numpy.sin(P))
    return P

I can call createarray2 from matlab by using these commands: testmat2 = py.importlib.import_module('testmat2');

>> testmat2.createarray2(2)
2
ans =
    int64
     2

However when I call createarray, matlab can't handle this request:

   >> testmat2.createarray(2)
  Error using numeric>ones (line 192)
  Python Error: TypeError: 'float' object cannot be interpreted as an index
Error in testmat2>createarray (line 24)
    P = numpy.ones(2);

How do I get matlab to use functions that use import statements.

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Answer 1

Robert Snoeberger 2017-7-17

4
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https://ww2.mathworks.cn/matlabcentral/answers/348650-how-do-i-call-a-custom-python-function-from-matlab-that-uses-an-import-statement#answer_274437

在 MATLAB Online 中打开

Based on the error message, "TypeError: 'float' object cannot be interpreted as an index" you are passing a double when you should be passing an integer, such as in32. Try this:

>> testmat2.createarray(int32(2))

Note that the literal 2 is a double in MATLAB. When it is passed to Python, it is automatically converted to a Python float [1]. That is what the error message is complaining about.

[1] https://www.mathworks.com/help/matlab/matlab_external/passing-data-to-python.html