Hi, I have been working with Simulink just for few days. I have a Discrete State Space system. My input is defined in the "Model Configuration parameter" as [time',i1s',i2s'], where i1s and i2s are my source currents. Let's say that the size of i1s' is equal to N x 1. I get a voltage as an output. Now, the output should be a vector that has a number of rows equal to 2N x 1. I want to extract only the first N rows. Which block shall I use in Simulink? I am taking a look at Selector and Variable Selector but I cannot make them work.