My favorite advice on debugging is from Professor Norman Matloff:
Finding your bug is a process of confirming the many things that you believe are true – until you find one that is not true.
I would add to this my own observation:
You are not truly “debugging” until you (temporarily) remove all desire to fix the problem. Investigation must be entirely devoted to finding and seeing the problem.
Categories: Opinion Programming Tutorials
Data Scientist and trainer at Win Vector LLC. One of the authors of Practical Data Science with R.