Week 3, lecture 7 notes

week-03/lecture-07-debugging-part-2.md

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+Debugging - Part 2
+==================
+
+The primary tools for debugging functions in R are:
+
+* traceback
+	* Prints out the function call stack after an error occurs
+	* Does nothing if there's no error
+* debug: Flags a function for debug mode which allows you to step through execution of a function in debug mode
+* browser
+	* Suspends the execution of a function wherever it is called and puts the function in debug mode
+* trace: allows you to insert debugging code into a function in specific places
+* recover: allows you to modify the error behavior so that you can browse the function call stack
+
+These are interactive tools specifically designed to allow you to pick through a function. There's also the more blunt technique of inserting print/cat statements in the function.