Held: Tuesday, 3 March 2015

Back to Outline 24 - Recursion Basics. On to Outline 26 - Preconditions, Revisited.

Summary

We continue our initial forays into the wonder that is recursion.

Related Pages

• Reading: Recursion Basics
• Lab: Recursion Basics
• Morning EBoard 25 (Source a.m. 25)
• Afternoon EBoard 25 (Source p.m. 25)

Overview

• Reflection.
• Questions.
• Recursion vs. other forms of repetition.

Administrivia

I did not take time last week to condemn the postings on Yik Yak because I thought the president's statement sufficed. But it sounds like individual voices are necessary, too. And, as a technologist, I have particular responsibility to comment in this case. So I should have done so more promptly. I apologize for the delay, particularly because this issue is very important to me.

Let me make it absolutely clear. Use of any medium - social, physical, virtual - to denigrate other people for their characteristics is completely unacceptable. I have updated our course front door to clarify this perspective. (If you have comments on how to better phrase my policy, I would appreciate them.)

• Continue partners.
• No daytime review sessions on Thursday. Evening review session at 8:00.
• Office hours today at 10:00 a.m. and 3:15-4:30.
  • http://rebelsky.youcanbook.me

Upcoming Work

• Homework 6.
  • Optional! Replaces lowest homework grade.
  • Due tonight at 10:30 p.m.
  • If you don't do the homework, promise to get two hours of extra rest. (No message necessary.)
  • I will distribute an answer key to the homework by Sunday night.
• Exam 2 released at 5:00 p.m. today. Due 10:30 p.m. Thursday the 12th.
• Reading for Wednesday:
  • Verifying Preconditions
• Friday's quiz: Pictures!
  • No, you don't have to get everyone. About 85% correct will earn you full credit.
  • Doing better than me will also earn you extra credit.

Extra Credit Opportunities

Academic

• Any of the disability activities this week.
• David Berliner lecture Thursday at 7:00 p.m. in Harris.
• CS Table Friday - Unknown topic.
• Town Hall on Town Halls, noon or 7:30 p.m. on March 11.
• Post-break: April 1 Scholars Convocation on Implicit Bias.

Peer Support (Morning Section)

• Julia's radio show, "The Hot Box". Wednesday night/Thursday morning 1:00-2:00 a.m.
• Orchestra Saturday at 2 p.m. in Sebring-Lewis: Musicals, Show Tunes, and Soloists.

Peer Support (Afternoon Section)

• Belly Dancing Club Wednesday, 7-8 p.m.

Miscellaneous (Extra Credit)

• Fill out the American College Health Association's National College Health Assessment survey. (Yes, your response can be "I filled out the survey.")

Other Good Things (No Extra Credit)

• Orchestra Saturday at 2 p.m. in Sebring-Lewis: Musicals, Show Tunes, and Soloists.
• Belly Dancing Club Wednesday, 7-8 p.m.
• Tour Flanagan Theatre to see how it has been transformed for Nobody Gets Hurt.

Questions

How should we ask whether a list has one element?

(null? (cdr lst))

Do not use (= 1 (length lst))!

When will we get the quizzes back?

Wednesday, I hope. Otherwise Monday.

Reflection

• What have you understood so far?
• Why do we need recursion when we have map?

Questions

• What needs clarification before we go on?

Lab

• Begin the lab on recursion
• Be prepared to reflect and to ask questions.

Reflection

• What else have you learned?