• New Partners! (Take a card to figure out where you are and who your partner will be.)
  • Don't forget to introduce yourself to your partner!

Overview

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

Preliminaries

Admin

• Quiz 1 to be returned tomorrow.
• A lot of snow is scheduled within the next day. Please be careful.
• The Registrar wants me to remind you that Add/Drop deadline is Friday.
• Enjoy caucusing (or watching the Caucuses) tonight!
• Email policies
  • When you send me email asking questions, it helps if you title it something like "HELP" or "QUESTION". (Yes, all caps is okay.)
  • I tend to respond to email promptly, but I get a lot of email. If I haven't responded to email within 24 hours, send me a reminder.
• Yes, I know that I have to work on the formatting of today's lab.

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.
• Tutor hours
  • Sunday, 3-5 p.m.
  • Sunday-Thursday, 7-10 p.m.
• Weekly review sessions:
  • Wednesday at 8pm in the CS Commons with Sarah
  • Thursday at 10am in this room with SamR
  • Thursday at 8pm in the CS Commons with Kumar

Upcoming Work:

• Reading for Tuesday: Transforming RGB Colors
• Assignment 2 due TOMORROW! at 10:30 p.m.
• Lab Writeup: Exercise 9
  • Send email titled CSC 151 Lab Writeup 5 (Your Names)
  • Do not include the underscores.
  • Send to CSC151-02-grader@grinnell.edu
  • Due before class on Wednesday.

Extra Credit

Academic

• CS Table, Tuesday, Noon, White PDR: Facebook's Walled Internet. (Readings to be distributed via email.)
• Community Conversations on Race, 7:30 p.m., Tuesday, February 2, Lazier 3rd Floor Lounge
• CS Extra on Thursday: LaTeX (4:15 p.m., 3813)

Peer

• Track and Field Grinnell Invite February 6. (30 min suffices)
• Swimming February 6 vs. UN and IAState, starts at 1pm. (30 min suffices)

Miscellaneous

• Caucus TONIGHT. (Or observe a Caucus.)

Questions from Sam

What does round do?

Questions from Students

How do we submit extra credit.

Send a message titled something like "CSC 151 Extra Credit (Your Name)" to rebelsky@grinnell.edu.

The message should be your reflections on the talk or activity. I don't really need summaries.

You should strive to do this within two days of the event.

When we rewrite the algorithm, should it just return yes/no or should it give a count of matching birthdays?

You only need to give yes/no, but a count would be cool, too.

However, you should be careful. I've seen algorithms that give the wrong count if three people have the same birthday.

Do you want us to base our algorithm off of the bad one that was there, or should we start from scratch?

Either.

What are the odds that I ended up with the same partner?

The odds that someone ends up with the same partner are reasonably good.

GIMP and DrRacket aren't playing nice. Why?

Sam is not necessarily competent. But we'll try to fix it today.

Are mentor sessions in the commons?

Yes.

Where is the commons?

We think it's Science 3817. It's the big room that overlooks Kistle.

Lab

I'm getting an error message that says "DBus not working!"

Go to GIMP and under the Mediascript Menu select Start DBus Server

The color swatch isn't showing up

Try (image-show (color-swatch (irgb 255 0 0)))

I'm getting an error message at the bottom that says "default-load-extension-handler ..."

Ignore it Sam is not competent. He has no idea what it's happening and can't fix it.

Lab writeup: Exercise 9

Debrief

Things that I hope you thought about ...

• How (and why) to write nested Scheme expressions. (image-show (color-swatch (irgb 200 100 200)))
• Different ways of thinking about colors (names, three components, etc.) (None of these things are colors.)
• How you will keep track of the vocabulary.