How to access class and functions from python

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Arshad Pasha
Arshad Pasha 2018-9-18
编辑： Arshad Pasha 2018-9-28
Hello All,
I am trying to access matlab code in python. I have referred ref1 and ref2 I am able to work with single function code, but not with a multi function code as mentioned in ref2 or even this basic example
classdef Test1
properties (Access = private)
input1 = 0;
input2 = 0;
end
methods
function out1 = ADD_1(this,i1,i2)
this.input1 = i1;
this.input2 = i2;
out1 = this.input1 + this.input2;
end
function out2 = SUB_1(this,out1)
out2 = out1 - 1;
end
end
end
What I have tried is
import matlab.engine
eng = matlab.engine.start_matlab()
eng.addpath(r'C:\Users\Python_file_test', nargout=0);
func1_out = eng.ADD_1(10,20)
I get an error
MatlabExecutionError: Undefined function 'ADD_1' for input arguments of type 'int64'.

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采纳的回答

Siddharth Bhutiya
Siddharth Bhutiya 2018-9-21
Whenever you create a class in MATLAB it will be a Value class by default. However, while working with MATLAB Engine for python you can only use MATLAB Handle classes, which is mentioned in the link below
https://www.mathworks.com/help/matlab/matlab_external/handle-data-returned-from-matlab-to-python.html
So in order to make the above example work, you will have to make your class a handle class which can be done by replacing the first line of your MATLAB code to
classdef Test1 < handle
Another thing to note here is that the function signature of ADD_1 indicates that it needs 3 inputs: Test1 Object(this), first number(i1) and second number(i2). So inside your python script, you will have to create an object for Test1 and pass it as the first argument of ADD_1
myobj = eng.Test1()
func1_out = end.ADD_1(myobj, 10, 20)
I believe that the above changes should resolve your issue.
  1 个评论
Arshad Pasha
Arshad Pasha 2018-9-28
编辑：Arshad Pasha 2018-9-28
Hey Siddhart, thank you, that worked. Just a follow up question, how to handle the recursive functions, let's say a function is called every 1 second in matlab, can I monitor that or call that via python similar to what you have suggested previously. just to simplify, want to call the ADD_1 function 10 times in a loop via python.
classdef Test1 < handle
properties (Access = private)
input1 =0;
input2 = 0;
end
methods
function out1 = ADD_1(this,i1,i2)
this.input1 = i1;
this.input2 = i2;
out1 = this.input1 + this.input2;
end
function out2 = SUB_1(this,out1)
out2 = out1 - 1;
end
end
end

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