CSC151 2007S, Class 11: Iterating Over Positions

Admin:
* Are there questions on Homework 6?
* Tutoring for 151
  * Common Tutoring sessions - 9-10, Sunday through Thursday
  * CS151-specific with Max and Lorelei, 8-9 Monday and Thursday
  * Individual tutoring (paid by the College): Talk to Marge Coahran
    (coahranm@cs.grinnell.edu)
* How long are homeworks taking?
* Reading for tomorrow: Booleans and Predicates (longer than normal)
* Reminder: Take-home exam 1 will be distributed on Friday and due the following Friday.
* Advance notice: EC for Tony Leguia's talk Thursday at 4:15 in 3821.
  * "Sorting out children by sorting out digraphs"
* Assigned groups for the next few weeks.
* Note: The printer room is directly west of here

Overview:
* Iteration, a key aspect of algorithm design.
* Iterating over positions.
* Blends and other positionally-computed images.
* Simulating image.map!.

/Why Assigned Teams?/

* You learn better when you talk to people about what you are doing!
  * "Two heads are better than one"
  * When you ask questions of each other, you learn
  * When you explain what you are doing, you learn
* We see evidence
  * At Grinnell
  * Elsewhere
* Why assigned teams?
  * Ensures that teams form ; no "last person picked"
  * Helps share ideas around the room
  * Plus, you get to meet new people
  * Reinforce instructor authority
* Side note: On gender and groups

/Lab/

* Sam has talked enough; attempt the lab!

/Debrief/

* Sam is sentient and malicious
  * Sometimes he inserts incorrect examples so that you read them
    carefully
  * In fact, *every* error that you see was inserted for that reason
* Printing
* Wasn't it fun to meet new people?
  * Correct answer: "Yes, Sam, it was an astounding experience.  Please
    give us new groups all the time!"
* Best comment today:
  " I love it when things work"