• Continue partners and places. Those who were absent on Wednesday should work on Dahl.

Overview

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

Preliminaries

Admin

• The Registrar's Office wants you to know that today is the last day to add or drop a full-semester class.
• Today's lab will continue through Monday's class, although we may have a writeup from early in the lab.
• Friday PSA.

Reminders

• Office hours: MTWF 10-11, Tu 1-2.
  • Sign up at http://rebelsky.youcanbook.me.
  • Also feel free to stop by when my door is open.
  • Or to email me for an appointment.
• Tutor hours
  • Sunday, 3-5 p.m.
  • Sunday-Thursday, 7-10 p.m.
• Weekly review sessions:
  • Wednesday at 8pm in the CS Commons with ?
  • Thursday at 10am in this room with SamR
  • Thursday at 8pm in the CS Commons with ?

Upcoming Work:

• No additional readings for Monday, although you might want to review the ones for today.
• Assignment 3 due Tuesday at 10:30 p.m. (Your assignment partner is your partner from today.)
• Lab Writeup: Exercise _
  • Send email titled CSC 151 Lab Writeup 8 (Your Names)
  • Do not include the underscores.
  • Send to CSC151-02-grader@grinnell.edu
  • Due before class on Tuesday.

Extra Credit

• Send to rebelsky@grinnell.edu with subject "CSC 151 Extra Credit".

Academic

• Africans vs African Americans, Noon, Saturday, JRC 101.
• Aids in South America Talk in ARH 305 at 4:15.
• Franz Schubert's Winterreise, Sunday, 2 p.m. Sebring-Lewis
• Next week's Rosenfield Symposium on Campaign Finance
• Monday, February 8, 4:15 p.m. in Bucksbaum Miriam Langer enjoins you to "Do Your Work in Public" (part of the series "Digital in Public: Intellectual and Technical Skills for Making a Difference")
• Monday, February 8, 7:30-9:00, JRC 101: The Complex Relation Between Alcohol and Sexual Assault
• Noon Tuesday in the White PDR: Bowie, Mickey, and the NFL: Copyright in the 21st century (copies of the reading outside Sam's office)
• 7:30 pm next Tuesday in ARH 131 - Funding for unfunded internships
• Anything in next week's Carnival and Creativity series

Peer

• Track and Field Grinnell Invite February 6. (10 a.m.)
• Swimming February 6 vs. UN and IAState. (1 p.m.)
• Love Notes. If the $2 is a stretch, Sam will pay. Email the person mentioned in class or JS.

Regular Peer

• Social Dance Workshop Tuesdays 7:00-8:00 in Bucksbaum Dance Studio (starting next week)
• Pun club Saturdays at 4pm in Younker (max 2)
• Socrates Cafe' Saturdays (max 2) email [socratescafe] to be added to the mailing list to hear about the top secret meeting location
• Electronic Potpourri on KDIC Fridays at Five

No Extra Credit, But Still Good

• Fill out the Disability Student Space Survey https://docs.google.com/forms/d/1hIXOjkd1j9goBgoWoDv2EiZu8vhhETOZS3bDTcKypLE/viewform?usp=send_form

Questions

• Coming Monday.

Quiz

Lab

Three important lessons from today's lab ....

1. The (define ...) tab is really useful.

2. If you write

   (define bound
     (lambda (val lower upper)
       (min (max val lower) upper)))
   

and then call

    (bound 5 0 10)

DrRacket substitutes 5 for val, 0 for lower, and 10 for upper, giving

    (min (max 0 5) 10)

Which it then computes.

1. Indentation can improve readability

   (define rgswap (lambda (color) (irgb (irgb-green color) (irgb-red color) (irgb-blue color))))
   
   
   (define rgswap
     (lambda (color)
       (irgb (irgb-green color)
             (irgb-red color)
             (irgb-blue color))))
   

2. Zachary says "Save early and often."

3. Sarah says "Mark where you are in the lab."