Accessing variables from workspace into user-created function block in Simulink

Good afternoon,

As the title suggests, I defined some variable say, x in the workspace that has a number.

Using MATLAB function, I am trying to import that variable (just once!) and as simulation progress, under

certain condition, I want to increment that variable. However, since the function does not 'see' the variable x,

I end up declaring that variable inside the MATLAB Function Block. However, this keeps initializing the variable

and thus, I cannot increment it.

I need help to resolve this problem!

Answer 1

[Azzi Abdelmalek]

You can declare your variable as persistent

function y=fcn(u)
persistent v
if isempty(v)
  v=your_constant
end
v=v+increment

[Daniel]

yes about that. I was looking around and I was messing with persistent as well. Would you mind explaining what exactly persistent does? I read the help doc it doesn't really ring a bell.. Thank you anyways!

[Azzi Abdelmalek]

At time =0 , v takes the value your_constant. And each iteration the variable v will be incremented. persistent allows to remember the value of v

[Daniel]

Actually I figured it out. No need for an answer. Thanks for brilliant answer!