CSC151.01 2015F, Class 37: Pairs and Pair Structures
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_Overview_

* Preliminaries.
    * Admin.
    * Upcoming Work.
    * Extra Credit.
    * Questions.
* Quiz.
* Lab.

Preliminaries
-------------

### Admin

* Continue partners!
* Review sessions next week:
    * Monday, 8pm (Zachary)
    * Wednesday, 8pm (Caleb)
    * Thursday, 10am (SamR)
    * Thursday, 8pm (Erin)
* I've added MTWF at 1pm to my office hours.
* It's almost preregistration time.  Should you continue in CS?  I hope
  many of you will.
    * Are you enjoying CS?  (And why are you enjoying CS?)
    * Can you spend the time on CS?
    * Are you likely to succeed?  (I'd be happy to discuss this with you.)
* I will get exams back to you by Monday of week 2 of prereg, so that
  you can think about likely success.
* Friday PSA

### Upcoming Work

* PROLOGUE TO EXAM 3 is due TONIGHT!
* Exam 3 is due Tuesday night (printed Wednesday)
* Reading for Monday: 
  [Vectors](../readings/vectors-reading.html)
* Today's Lab writeup (due before class Tuesday)
    * Hand in to SamR with your name at the top.
    * Exercise: 3

### Extra Credit Opportunities

* If possible, send me these in advance.

#### Academic

* Any visit to the current show in the Faulconer gallery.
* Learning Deconstructed Workshop Series, Tuesdays at 11 in JRC 209.
* Any activity with Visiting Musician and Sound Artist Ellen Fullman.
  (Yes, that includes Drinks @ Lonnski's on Thursday.)
* Sexual Misconduct at Grinnell College: Results from the 2013 and 2015 
  Sexual Conduct Surveys.  1-3 pm, November 8, JRC 101.
* *CS Table next Tuesday.*
* *CS Extras next Thursday.*

#### Peer Support

* EC for ISO Food Bazaar.  Nov. 15, 5-7 pm, Harris Gym/Concert Hall.
    * Sam will advance/reimburse the $10 if you feel that it's a financial stretch.  
    * Tickets are on sale today, 11-1, 5-7.  
* Alumni Game for Womens Basketball 1pm on Saturday.
* Project Pengyou has brunch at 10:30 a.m. Saturday in Chinese House 
  across from ARH.
* Blackout event at BCC.  Dance.  Have fun.  Sam has paid for 13 of you.
  $3.00.  

#### Regular Peer Support

* Pals of PALS, pals@grinnell.edu, normally Saturday at 7:45 am (breakfast
  included; felins only), and Mondays at 4:45.  Requires sign up in 
  advance.    MORE HELP NEEDED!
* Socrates Cafe', Saturdays, Younker, 2pm.
* Pun Club, Saturdays, 4pm, Way over Younker.

#### Upcoming Peer Support

* November 14, Orchestra Concert, Sebring Lewis, 7:30 p.m.
* Women's Basketball Opening Game, 1 pm, Nov. 15, vs. Silver Lake.
* Translations (play), Nov. 19-23 or so.  Erin stole a barn from
  MN just to make the play better and is distressed about it.
* One-act Festival Dec. 5 & 6.

### Questions

_How do you check if your prologue is submitted properly?_

> Ask Sam.

> Generally, you should write your prologue in a separate document and
  then copy and paste.

> Make a bad joke and see if I respond.

_What are the hardest (most time consuming) problems?_

> 3 and 6.  5 is either easy or impossible.  Think about them all early
so that you can reflect on them while dancing at Blackout.

_Can I make random numbers that are negative?_

> Yes.  Do the reading and lab.  Then ask me.

Quiz
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Lab
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Writeup: Problem 3
  * You won't be able to do it well unless you do problems 1 and 2.

A list of one value looks like this:

    +---+---+
    | * | / |
    +-|-+---+
      v
     val

A list of two values looks like this:

    +---+---+    +---+---+
    | * | *----> | * | / |
    +-|-+---+    +-|-+---+
      v            v
     val          val

A list of three values looks like this

    +---+---+    +---+---+    +---+---+
    | * | *----> | * | *----> | * | / |
    +-|-+---+    +-|-+---+    +-|-+---+
      v            v            v
     val          val          val