Week 2 Exercises

Exercise 1

I have gone through those emails and created a list of people who emailed each other. Each line takes the form a,b which indicates there was an email between a and b. Here is a file with 1,000 lines from that adjacency list.

Write a perl script to count how many messages are to or from the address taylor@enron.com.

Important Hint: There are a few ways to write this code. If your code seems to be running, but it's returning 0 emails from that address, you may be doing your comparisons in a way that requires you to put a \ before the @ sign. Try using "taylor\@enron.com" in place of "taylor@enron.com" and that will probably help. This is a good general hint. Because the @ also shows up in front of arrays (like the $ in front of variables), perl can get confused when you use it in strings. If your code has problems and there are @s, try delimiting them.

Extra tricky extension: How many email addresses do NOT end in enron.com? There are things we haven't learned that will make this easier, but it can be done with only the stuff we've learned.