Overview

• Preliminaries.
  • Admin.
  • Upcoming Work.
  • Extra Credit.
  • Questions.
• About the project, revisited.
• Group composition.
• Time to form groups.
• Playing and brainstorming.

Preliminaries

Admin

• 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.)
• I will need to leave promptly at 3:50 for a faculty meeting.

Reminders

• 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 noon with SamR
  • Thursday at 8pm in CS commons with Alex
  • None with Sam this week

Upcoming Work:

• Reading for Tuesday
  • Reading: Binary Trees
• No Lab Writeup!
• HW Due Tuesday night!

Extra Credit

• 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!"

Academic / Artistic

• Any of the fora on the report from the Residential Learning Task Force. (Formal announcement and times forthcoming.)
• "The Politics of Naming and Shaming: Human Rights Organizations and Reporting", Tuesday, April 19, 4pm ARH 102
• Build Your Own University, Wednesday, April 20, 1-3pm, Masons Building
• Math/Stats Student Seminar, Eliz Eason and Jun Take Lee: Cascades and Multifractals - noon, Thursday, April 21
• Classics Seminar with Really Cool Alum, April 21, JRC 101, 4:15 pm
• Presentation, Statistical Modeling in Genome-Wide Association Studies: Identifying Disease-associated Genes Using Gene Pathways", Thursday, April 21, 4:15 p.m., ARH 102
• Sharon Day, Environment and more, Friday at 7 pm (more details forthcoming)
• 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

Peer

• 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. Free sticky food!
• R&B Soul in Herrick at 7pm
• Drag, Saturday. Bring money to give to the performers to give to charity.

Regular Peer

• 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.

Misc

Not so Far in the Future

• Adaptation of Rushdie's East West. May 5 and 6.
• May 6: 24 hours of Improv. (Show up for 30 minutes for EC; CB needs to go to all 24 hours for EC.)
• Is anyone in 25th Annual Putnam County Spelling Bee?

Questions

Can we talk our way through number three.

What is the problem? Draw a snowflake-like object.

Inputs: turtle, side-length, number-of-sides, depth

Depth: How many sizes of shapes to make

This is a recursive task. We made the side length smaller at every step. But we can also think about this as recursing over depth.

What's your base case?

One possible base case: 1 deep

    repeat sides times
      move forward by side length
      turn counter-clockwise by the approriate angle (90 degrees
        for a square)

Recursive case

    repeat side times
      move forward by side length
      RECURSE
      turn counter-clockwise by the appropriate angle

Problem: Let's try it.

Observation: It looks like we need to keep track of whether we are rotating clockwise or counter clockwise. The recursive call is in the opposite direction.

Suggestion: Helper (local) that keeps track of level, side length, and clockwise/counter-clockwise.

Do we really need both iteration (repeat) and recursion to solve this?

It works best that way.

Is 1 really the best base case?

No. Use 0 as the base case. Do nothing in that case.

    (cond
      [(zero? depth)]
      [else
       (repeat ...
               ...)])

About the project, revisited

• Make a program that makes 1000 "interesting" images
• Sam recommends that you think about this as an opportunity to explore an existing non-representational image in depth
• Make sure to use multiple techniques
• That scales appropraitely (without using image-scale, except if you start with "source images")

Group composition

What skills will you need in your team?

• Well, like you're going to need those programming skills. Coder. YELLOW.
• Someone less shallow than the typical programmer, so that the images have some meaning/interesting to them. Artist. PURPLE.
• Manager. Someone to keep the artist and coder focused on the requirements of the project. Also requires organizational skills. GREEN.
• Devil's Advocate. Someone to break the project, because you know that Sam will try. RED

Also need skills as a whole

• Nice people, who are patient with each other. (Done. You are all Grinnellians.)
• Ability to align schedules. (Failed. You are all Grinnellians.)

Time to form groups

Playing and brainstorming