Held: Wednesday, 17 February 2016

Back to Outline 14 - Drawings as Values. On to Outline 16 - Programming the GIMP Tools.

Summary

Today we explore Scheme's list data structure and some ways to use lists to make interesting images.

Related Pages

• Reading: Making and Manipulating Homogeneous Lists
• Lab: Making and Manipulating Lists of Drawings
• EBoard 15 (Source 15)

Overview

• Context: What and why lists?
• Building lists.
• Mapping lists.
• Other list operations.

Administrivia

• Continue partners!

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.
  • Probably no office hours on Friday b/c of swim meet.
• Tutor hours
  • Sunday, 3-5 p.m.
  • Sunday-Thursday, 7-10 p.m.
• Weekly review sessions:
  • Wednesday at 8pm in the CS Commons with Evan.
  • Thursday at 10am in this room with SamR!
  • Thursday at 8pm in the CS Commons with Kumar.

Upcoming Work:

• Reading for Wednesday:
  • Making and Manipulating Homogeneous Lists
• Exam 1 cover sheet due now.
• Assignment 4 due next Tuesday at 10:30 p.m.
• Quiz Friday: Identify your classmates (and mentors) (and teacher) (and maybe that little dog that wanders into the classroom)
• Not quiz Friday: Six-Ps, Testing, Drawings as Values
  • Yes, we'll probably talk about thse issues in the review sessions.
  • Mostly testing
• Lab Writeup: Exercise _
  • Send email titled CSC 151 Lab Writeup 14 (Your Names)
  • Do not include the underscores.
  • Send to CSC151-02-grader@grinnell.edu
  • Due before class on Monday.

Extra Credit

• Send your reports to rebelsky@grinnell.edu with subject "CSC 151 Extra Credit".
• Send opportunities to me before class with subject "CSC 151 EXTRA CREDIT OPPORTUNITY!"

Academic

• Convocation: Hilary Mason '00 on Data Science and Social Good. (11 a.m., Thursday, JRC 101)
• CS Extras: Hilary Mason on Fast Forward Labs. (4:30 p.m., Thursday, Science 3821) (reception at 4:00 p.m. in the CS Commons)

Peer

• Swim Meet, Friday, Saturday, and Sunday, Osgood Pool. (30 min.)
• Time for swim .
• Lunar New Year Festival, Saturday (?) 5:40 pm until 7:30 pm in Harris.
• Pun Club Tournament Friday the 26th in the evening.
• Contra Dance Friday the 26th in the evening.
• Improv Show the 27th in the evening in Loose Lounge.

Regular Peer

• Social Dance Workshop Tuesdays 7:00-8:00 in Bucksbaum Dance Studio
• Pun club Saturdays at 4pm in Younker (max 2)
• Electronic Potpourri on KDIC Fridays at Five (TONIGHT)
• Space Odyssey KDIC Fridays at Six

No Extra Credit, But Still Good

Context: What Are Lists?

• Issue: We'd like to make images with lots and lots of similar shapes.
• Problem: How to do so systematically.
• Solution: Scheme's list data structure and some related procedures.
• We're learning a new type, so it's useful to figure out some basic issues.

Building Lists

• (list val1 val2 ... valn)
• (make-list n value)
• (iota n)

Mapping Lists

• Basic operation: (map func lst). Apply a function to each element of a list.
• For images, we'll find it easier to do something like
  (map drawing-transform list-of-drawings list-of-values)

Other List Operations

• (append *lst1* *lst2*) - join two lists
• (reverse *lst*) - just what it sounds like
• (list-take *lst* *n*) - take the first n elements of a list
• (list-drop *lst* *n*) - drop the first n elements of a list

Lab

• Do the lab.
• Be prepared to reflect.