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

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.

Answer 1

[MathWorks Support Team]

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

Answer 2

[Gaganjyoti Baishya]

Hi,

You can easily add variables in base from function using assignin.

function myFunc(a,b)

x=3;

assignin('base','myVar',x);

end

assignin declares the varibale myVar with value of 3.