What are these blocks in Simulink and how to find?

Specifically the very long green rectangle block and the red block. I tried searching through the library, but I couldn't find them. I am following a older tutorial, so I am unsure if it is a version difference.

[Paul]

The long green block is Vector Concatenate.

Answer 1

[Walter Roberson]

The triangular blocks appear to be gain blocks https://www.mathworks.com/help/simulink/slref/gain.html

The long green rectangle block looks like a mux block https://www.mathworks.com/help/simulink/slref/mux.html

I am not sure at the moment what the red block is. The stairs notation reminds of of discretization, but the graphic icon for the discretizer block is different than that.

[Michelle]

Thank you for your help!

Answer 2

[Sam Chak]

Hi @Michelle

The red block is the Zero-Order Hold block, typically used to "hold" the value of the current sampling point until the next sampling point arrives. It converts a continuous-time input signal into a discrete-time (sampled) signal.

When constructing a model in Simulink, do not rely solely on the visual representation. Instead, ensure that you understand the mathematical description of the model. A good tutorial should clearly present the mathematical model. If the mathematical model indicates the addition of individual signals, you will need to use the "Add" block.

[Michelle]

Thank you for sharing about the Zero-Order Hold block! I will research to gain a better understanding of modeling in Simulink.