How to determine previous input in MATLAB Function block in Simulink?

I am trying to simulate Miller-L code in simulink using MATLAB Function block. The input is a Random Integer generator generating binary input 0 and 1 at a rate of 1 KHz. I want to code so that

if Previous_bit == 1
    no change in output
else
    change output state
end

Hoe can I do this? I tried using loops but didn't work.

Answer 1

[Walter Roberson]

You cannot determine the previous input.

If you are using a MATLAB Function block, you could use "persistent" to remember the previous input. If you are using a Level 2 Function then you could use a dwork vector to remember the previous input.

But remember that the previous input might be for a time after the current time.

Consider using a Memory Block, or a First Order Hold, or a Transfer Function, or a Flip Flop.

[Bhargava Reddy Banala]

Thanks. I will try that.