Assigning Dynamic Variables in Simulink

Question

Sushanth Manchikatla 2020-8-10

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https://ww2.mathworks.cn/matlabcentral/answers/577678-assigning-dynamic-variables-in-simulink

回答： Fangjun Jiang 2020-8-10

How do I create a variable/ output a variable from a function using user defined matlab function block in simulink. The code of which is given below:

function y = fcn()
y = input('enter the variable value: ');
end

Using this code for the function gives an error in SIMULINK. I want Simlink to ask me for the value to be entered once I start the simulation.

Assume the there are only two blocks, i.e. User-defined function block and display block in simulink workspace.

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Fangjun Jiang 2020-8-10

This is unrealistic. Keep in mind that the MATLAB Function block is executed in every simulation step, like every 1ms. Do you want to enter the value 1000 times for 1 second of simulation? What is your real need?

Sushanth Manchikatla 2020-8-10

I need to create an interface where I can fix variable(s) by chosing from a prompt given by simulink/matlab. So how do I code this prompt? And this variable is fixed for all the simulations. I dont want to put the variable as a constant and change the value by opening the workspace everytime. Instead I need a seperate code which allows me to change the value for every execution.

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