Since our professors don't care to update their labs from year 2001 that aren't compatible with modern MATLAB, here's a fixed version of the code from section 4.2 of Lab 3. There wasn't only compatibility issues but also literal mistakes in the code itself. Welcome to Carleton University, where the K stands for Quality.
Type drawpendulum(out); in the console after you run the simulation from lab 3 (it will generate a package of the output results called "out"). Follow the naming conventions in the lab for this to work.