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ERROR: Python in Simulink: Class mismatch for variable 'commandOut'. Expected 'double', Actual 'char'.

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Sriharsha 2015-3-10

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回答： Robert Snoeberger 2015-3-10

I get an error while Running a Python Script in a Simulink Model

function y = Test_1(a,k)

coder.extrinsic('tic','toc', 'system','clear' ,'clc','num2str' );

commandStr = ['C:\LegacyApp\Python27\python sqd.py ',num2str(a),' ',num2str(k)];

[status, commandOut] = system(commandStr);

y = coder.nullcopy(zeros(size(a),'double'));

y=commandOut;

This is the Error which i got during compilation:

Class mismatch for variable 'commandOut'. Expected 'double', Actual 'char' .

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回答（1 个）

Robert Snoeberger 2015-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/182377-error-python-in-simulink-class-mismatch-for-variable-commandout-expected-double-actual-char#answer_170811

commandOut , the second output argument from system , is a char array. See the doc . You used num2str to convert to char arrays from the variables a and k . Similarly, you need to convert to double from commandOut . You may be able to use str2num .

If you are using R2014b or newer, then you can call Python from MATLAB .

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