Overview

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

Preliminaries (Postliminaries?)

Admin

• New partners! These will also be your homework partners.
• Sorry about arriving late.
• Office Hours: Normally: 10:00-11:00 MTWF
• Please follow the suggestions for the title of your email messages; many of the graders have filters running to automatically move work to grade into a particular folder.
• I'm going to try to talk less today; we'll see how well I do.
• Quiz 2 is Friday
  • Evaluation in Scheme (define, order of evaluation, etc.)
  • Drawings as values
  • Not procedures
• Don't forget: Review sessions Thursday at 9:00 a.m. and 1:15 p.m., Mentor session Thursday at 8:00 p.m.
• I'm going to try talking less at the start of class today. You'll need to take responsibility for reading the outline/eboard for announcements.
• We normally expect today's lab to take about 1.5 class periods.

Upcoming Work

• Assignment 3.
  • Due next Tuesday at 10:30 p.m.
• Lab writeup for lab 6 (today), due Friday before class: http://bit.ly/151-2015S-lab06
• No additional readings for Friday.

Extra Credit Opportunities

Academic

• Friday, 12:10 p.m., JRC 224A (Day PDR), CS Table, RAID

Peer Support (Morning Section)

• Swimming, Friday, January 30, 6:30 p.m., Osgood Natatorium
• Swimming, Saturday, January 31, noon, Osgood Natatorium
• Julia's radio show, "The Hot Box". Wednesday night/Thursday morning 1:00-2:00 a.m. This week's theme is Transportation/Leaving.

Recommended Events (no EC unless mentioned above)

• #OneGrinnell, Wednesday, February 4 at 4:15 p.m.

Questions

Notes from Lab

Vocabulary

• We introduce new vocabulary each class (e.g., drawing-unit-circle, drawing->image). Once we've introduced a piece of vocabulary, we expect that you remember it (or can look it up)
• Flash cards!

Indenting

• Carriage returns are your friend. Multi-line Scheme expressions are much easier to read.
• In the definitions pane, control-I reindents for you. Make it a habit!

Syntax/Grammar

Schemers read

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

as

A function [that's the lambda]

With three parameters [that's the (val lower upper)]

In which are algorithm is ... [that's the (min upper ...)]