CSC151.02 2016S, Class 43: Higher-Order Procedures, Revisited

Overview

Preliminaries

New partners!
I will continue to bring you food (or food-like substances) until I am caught up on grading. (You may be getting food until you graduate from Grinnell.)
Sorry about yesterday. My wife tells me that it's about the fifth time she can recall that I've skipped class because I was sick. (And we've been married over 28 years.)
Note that there's a grading rubric for the project. Pay attention to it as you work on your proposal and project.
Yesterday went so well that I'm not going to talk any more.

Office hours this week
- See http://rebelsky.youcanbook.me.
- Ask me about other available times.
Tutor hours
- Sunday, 3-5 p.m.
- Sunday-Thursday, 7-10 p.m.
Review Sessions
- Wednesday at 8pm in CS commons with Zachary
- Thursday at 10 am with SamR
- Thursday at 8pm in CS commons with Alex

Reading for Friday
- Files
Lab Writeup: Exercise 5
- Send email titled CSC 151 Lab Writeup 43 (Your Names)
- Do not include the underscores.
- Send to CSC151-02-grader@grinnell.edu
- Due before class on Monday.
Quiz Friday!
- Trees
- Maybe more on turtles
Project proposals Monday.

Send your reports to rebelsky@grinnell.edu with subject "CSC 151 Extra Credit". (Do not include the quotation marks.)
Send opportunities to me before class with subject "CSC 151 EXTRA CREDIT OPPORTUNITY!"

Any of the fora on the report from the Residential Learning Task Force.
- Wednesday, April 20, 7:00-8:30 p.m., Noyce 2022
- Friday, April 22, 1:00-2:30 p.m., JRC 209
- Tuesday, April 26, 11:00 a.m. - 12:00 noon, JRC 101
- Tuesday, 6:00-7:00 pm, JRC 209
Math/Stats Student Seminar, Elizabeth Eason and Jun Take Lee: Cascades and Multifractals - noon, Thursday, April 21
Presentation, Statistical Modeling in Genome-Wide Association Studies: Identifying Disease-associated Genes Using Gene Pathways", Thursday, April 21, 4:15 p.m., ARH 102
Classics Seminar, April 21, Jeffrey Hurwitt, JRC 101, 4:15 pm
Scholars' Convocation: Dutch Global Horizons, Thursday, April 28, 11 am, JRC 101
Damon Williams: Bigger Than The Cops, April 28, 4pm or 5:15 pm

Lords of the Flies, 7:30 pm April 22nd, 2:00 pm April 23rd, 2:00 9pm April 24th. (Only 50-60 tickets per show)
Second Annual Contra into Spring Dance, April 22nd, Main Quad, 7:30 p.m.
R&B Soul Friday in Herrick at 7pm
Drag, Saturday. Bring money to give to the performers to give to charity.

Social Dance Workshop Tuesdays 7:00-8:00 in Bucksbaum Dance Studio
Post-break ExCo on British Politics Wednesdays at 8:00 in JRC 203.
Just show up; you don't need to sign up.
Pun club Saturdays at 4pm in Younker
Electronic Potpourri on KDIC Fridays at Five
Space Odyssey KDIC Fridays at Six
Bollywood, Fridays, 7:30-8:30, Younker
Effective Altruism club, 2:30-3:30 Sundays in JRC 226.

Apply vs. map example

map and apply both take a procedure and a list as inputs.
map applies the procedure to each element, one at a time, and creates a new list.
apply takes all of the list elements as input to one function call.

Examples

> (map list (list 1 2 3 4))
'((1) (2) (3) (4))
> (apply list (list 1 2 3 4))
'(1 2 3 4)

Exercise 2: Which do you prefer?

Exercise 3: Dot-Product

If your brain is sufficiently mangled, this is kinda fun.

(define dot-product (compose (l-s apply +)
                             (section map * <> <>)))

Exercise 4:

Exercise 5: Please write up this exercise