Declare global variable in simulink

In Simulink,I need to use one of the inputs to a function block in another saved function. So I want to decalre this input as global in the simulink but once i do that I get the following error.

Global declaration not resolved to a Data Store Memory block registered via the Ports and Data Manager.

Here the variable R is given as input and I want to declare this as a global variable and use it in a function which I am using in this model.

Answer 1

[Walter Roberson]

Global variables work differently in Simulink. See

https://www.mathworks.com/help/simulink/ug/using-global-data-with-the-matlab-function-block.html

[Lucky]

Thanks Walter, I have read this page but I still couldn't figure out how to do this.

I can't use the Data store memory and data read memory block as I am using these variables in a different function I have created. It also shows a way to go to model explorer and add a simulink signal . but I didn't understand that.

[Walter Roberson]

You do not need a Read Memory block. You need to create one Data Store Memory block for each global variable. The sequence is described at https://www.mathworks.com/help/simulink/ug/using-global-data-with-the-matlab-function-block.html#bsdud7d-1

You might need to do step 3 (Ports manager) for each different MATLAB Function Block you have that uses the global variable.

[Lucky]

This works .. thanks a lot Walter Roberson