CSC151.01 2014F, Class 16: Homogeneous Lists / Using Groups of Drawings ======================================================================== _Overview_ * Preliminaries. * Admin. * Upcoming Work. * Extra Credit. * Questions. * Key Ideas * Lab Preliminaries ------------- ### Admin * Continue lab partners. * Prof. Weinman is running class today. * Extra credit for sending me notes to post on the eboard. * Mentor sessions tonight at 8:00 p.m. and tomorrow night at 8:00 p.m. * Office hours: Thu/Fri 1:45-3:15; Also walking hours Thu/Fri 1:15-1:45. * Don't forget the review session Thursday at 10 a.m.! ### Quiz Topics * Integer-encoded RGB colors and the basic operations on those colors. * Standard color transformations. * Image and pixel operations, including `image-variant` and `image-transform!`. * `compose` and `o`. * (Possibly): lambda expressions, as used with the image transformations. * (Not): `map` and the other subjects we are doing today. ### Upcoming Work * Lab writeup: Exercise 5 Due Friday. * Printed copies of lab due at the start of class. * [Homework 4](../assignments/assignment.04.html) due next Tuesday. * Groups distributed via email. * Quiz Friday! * Reading for Friday: * [Boolean Values and Predicate Procedures](../readings/boolean-reading.html) ### Extra Credit Opportunities #### Academic * Convocation TODAY: Tara Zahra on Emigration from Eastern Europe * Please tweet interesting points with tag #GCConvo * CS Extras Thursday at 4:30: Mathematical Image Synthesis Toolkit (MIST) * CS Table Friday at noon: ??? * Campus Town Hall September 30 #### Peer Support * Noteworthy, Sat., Sept. 27, 3:30 p.m. Herrick * Science poster session, Sat., Sept. 27, morningish, science elbow * Football Games (Saturday, Sept. 27, at 1pm) * Men's Tennis (???) * Women's Tennis (???) * Swimming (???) * Anna Christie, Oct. 9-12 (SB plays Marthy) * Evan's radio show 5pm Friday nights on KDIC * Donna's radio show Sunday midnight on KDIC #### Miscellaneous * Participate in #GrinWell. * Friends of Drake Library needs help setting up for their annual booksale on Thursday, October 2 (conveniently, the same night as Grinnell High School's homecoming parade). You can help a good cause and probably get a few free books, too. * Update: They can also use help on Wednesday, October 1. ### Questions Key Ideas --------- * A list is a collection of values, in an order. * You can build lists using `list` (specific values), `iota` (values from 0 to n-1), and `make-list` (multiple copies of the same value) * You can build a new list by using `map` to apply a function to each element of a list. * `map` is much like `image-variant`, except for lists rather than images. (That is, both apply a function to each element in a collection and return a newly computed collection. In one case, it's an image. In the other, it's a list.) * `map` can also take multiple lists, and applies the function to corresponding elements of each list. Lab --- * Have fun! * Ask questions!