• New partners (who will also serve as homework partners)!
  • Separate cards for those who do and do not want a HW partner

Overview

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

Preliminaries

Admin

• Quiz Friday! Conditionals, higher-order procedures, and let.
• Review sessions Thursday 9:00 a.m., 1:15 p.m., and 8:00 p.m.
• Office hours Friday at 10:00 a.m. Also available informally after class today.
  • http://rebelsky.youcanbook.me
  • I'll see what I can do about freeing up Thursday hours.
  • If you don't see me in my office, check my lab (right next door).
• Our graders say
  • "Please limit your lines to eighty characters!"
  • "Remember that we are going to copy and paste your work into DrRacket. So don't add things after you copy and paste from DrRacket."
• Your peers say
  
  • "It's really helpful to save your work from the interactions pane."
  • "Copy-paste-comment"
• I plan to distribute an answer key to HW 5 tonight (or when the last homework comes in).

Upcoming Work

• Homework 6.
  • Due Tuesday at 10:30 p.m.
• Exam 2 to be assigned in a week.
• Lab writeup for today: Problem 3, http://bit.ly/151-2015S-lab22
• Reading for Friday
  • Building Data Structures with Heterogeneous Lists

Extra Credit Opportunities

Academic

• Pioneer Diversity Council Diversity Dialogue, 8:30 p.m. Thursday the 26th, Main Quad "Academic Athletes and Academic Students".
• CS Table Friday - Art, CS, and Artificial Intelligence.

Peer Support (Afternoon Section)

• Indoor Track this Saturday - GC Pride!

Other Good Things

• Neverland Players this weekend.
• Jazz band Thursday night.
• Orchestra a week from Saturday.

Questions

Lab/Debrief

Is it okay if the diagonal blend is close but not exact?

• Yes. Once we save as a PNG, we lose some resoultion.

How can I check my pixel values for a blend?

    > (define blend (horiz-black-blue-blend 100 100))
    > (map (lambda (col) (irgb->rgb-list (image-get-pixel blend col 50)))
           (iota 100))