How do I declare a variable in the MATLAB workspace from a MATLAB function?

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MathWorks Support Team 2009-6-27

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https://ww2.mathworks.cn/matlabcentral/answers/96238-how-do-i-declare-a-variable-in-the-matlab-workspace-from-a-matlab-function

编辑： MathWorks Support Team 2021-12-13

I wrote a function that provides some variables to Simulink. I have declared them global, so Simulink could see them. But I have to declare them at the prompt and I am unable to declare them in the function because Simulink does not see them.

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Answer 1

MathWorks Support Team 2021-12-10

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编辑：MathWorks Support Team 2021-12-13

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Simulink has access to any variable defined in the MATLAB workspace. You do not need to declare a variable 'global'. In order to define a variable in the MATLAB workspace from a function, you can declare the variables in the function using the command EVALIN. For example:

function declare_variable
......
evalin('base','k=100');
......

In this example, when the function 'declare_variable' is called, it will generate a variable 'k' in the MATLAB workspace. This variable can then be seen by the Simulink model. Please note that if, before the function 'declare_variable' is called, a variable called 'k' exists in the MATLAB workspace already, calling the function 'declare_variable' will overwrite the existing variable 'k' with the new value (100).

For more information on the EVALIN function, see the following URL:

https://www.mathworks.com/help/matlab/ref/evalin.html