The first time my co-advisor said "you're going to take the derivative of that code by the end of the day" I felt like I'd taken a wrong turn into crazy-town. I

The first time my co-advisor said "you're going to take the derivative of that code by the end of the day" I felt like I'd taken a wrong turn into crazy-town. I enjoyed reading about & understanding Tapenade — such a great piece of code!