What is this block?

[Walter Roberson]

That appears to be a Heaviside function. Are you asking whether there is a built-in Simulink block to implement it? I do not find it as a single block in Simulink

[Jfp45]

This block is from an old simulink diagram, and is acting as a heaviside, but i cannot find this block, an any built-in block in the library.

Answer 1

[Prashanth Krishnan]

As Walter mentioned, the block in the image represents a heaviside function. Unfortunately, there is currently no block for the 'heaviside' function in Simulink. However, there is a function in MATLAB that implements this, and is called "heaviside". Please refer to the following link for documentation on this function:

https://www.mathworks.com/help/symbolic/mupad_ref/heaviside.html

[Walter Roberson]

Correct URL should be https://www.mathworks.com/help/symbolic/heaviside.html as the one you gave was for use inside the MuPAD engine.

Either version uses the symbolic engine, which is a problem for Acceleration as nothing in symbolic toolbox can be compiled.

I would therefore suggest using a MATLAB Function Block with

result = double(u >= 0)

or

result = double(u > 0);

or

result = double(u > 0) + double(u == 0) * 1/2;

depending on the behavior that was wanted for 0 exactly.