--- title: Eboard 10 Documentation and precondition checking number: 10 section: eboards held: 2019-02-15 link: true --- CSC 151 2019S, Class 10: Documentation and precondition checking ================================================================= _Overview_ * Guest lecture * Preliminaries * Notes and news * Upcoming work * Extra credit * Friday PSA * Questions * Lab * Debrief Preliminaries ------------- ### News / Etc. * Mentor sessions Wednesday 8-9 p.m., Thursday 8-9 p.m., Sunday 5-6 p.m. * On Monday, I will distribute the final [class code of conduct](../handouts/code-of-conduct). * I was sorry to see so few of you at Thursday's important (but depressing) (or perhaps inspiring) Convocation. * It appears that some of you have not figured out that I have atypical office-hour conventions: The first priority for office hours goes to those who book times on . * **Don't forget to use [the exam template](../code/exam01.rkt).** * Thanks for all the good questions on the exams. ### Upcoming work * Reading due before class Monday * [Unit testing with RackUnit](readings/rackunit) * [Exam 1](../exams/exam01) due Tuesday night. * Prologue due **TONIGHT** * Epilogue due Wednesday * [Flash cards](../flashcards/flashcards05) due Wednesday at 8:00 p.m. * Covers Wednesday/Friday/Monday classes * [Lab writeup](../labs/writeup10) due before class Monday. * Exercise: 6 * Subject: CSC 151.01 Writeup for Class 10 (YOUR NAMES) * To: csc151-01-grader@grinnell.edu ### Extra Credit #### Extra credit (Academic/Artistic) * CS Extras, Thursday, 4:15 p.m. Science 3821: Sam talks about course design. (Snacks at 4pm in the CS Commons.) * Any Data Week activity this week. * HackGC weekend of 15-17 February 2019. * Acrobat performance 7pm in Harris. #### Extra credit (Peer) * Conference Swim and Dive meet, 15-17 February 2019. Dive times noon or 1, some time in afernoon, Fri and Sat. * Lunar New Year Celebration, 6pm February 17, Harris Gym * 3pm Saturday, Senior Day for Basketball. #### Extra credit (Wellness) * HIIT training, 4:30 pm, Tuesday, Dance Studio, Bear. (Cap of two EC units.) * HIIT training, 10:00 am, Saturday, Dance Studio, Bear * Hatha Yoga, 7:00 pm, Tuesday, Dance Studo, Bear. (Cap of two EC units.) * Brazilian Jiu-Itsu, Wednesday and Friday, 6:30, Dance Studio (cap of two EC units.) * Any Sex Week activity this week. (If you don't feel comfortable telling me about the particular activity, you can just say that you participated and give a vague reflection.) * Boxing 2pm Dance Studio tomorrow. #### Extra credit (Misc) ### Other good things ### Friday PSA * I am fortunate to teach you. Please take care of yourselves so that my fortune can continue. ### Questions Guest lecture ------------- * Welcome to Prof. Heather Richards-Rissetto * She works with Maya sites in Honduras (Copan is one location) * UNESCO world heritage site. * They reconstruct the sites in virtual reality. * They use Maya. Other people use Unreal Engine. * Rome Reborn is a cool project. * Immersive VR has been around for a long time * Archaeologists have been doing this since 1995 (and perhaps before) * Message: "The first Virtual Heritage conference (...) will discuss the use of computer graphics to reconstruct buildings which no longer work. * Example: Google sketchup * She started off in GIS (Geographic Information Systems) * Iconography: Position is important (those higher can see further, have more power) * They use LiDAR data to understand the underlying topography. * Understand what things looked like 1000+ years ago using the LiDAR data. * Transforms how we can look at things. * Reconstructs the environment in raster graphics * Automates a lot of things with scripting. * Can then compute what is visible from any location. Lets you look at relationships of visibility to status. * Now looking at sound! (E.g., how far can you hear from the Jaguar Stage) * Most of the analysis had been in 2D (or 2.5D data) * Since visibility was important, they've moved to VR stuff. * Using photogrammetry (which Sam can't spell). Take lots of shots with a camera and make a 3D model. * Relatively easy and low cost. * Started Maya City Builder project in 2015 or so. http://mayacitybuilder.org. * Using procedural modeling, they can combine their laser scanning, their photogrammetry, and their models * Procedural modeling * "What took me lots of time now gets done automatically" in terms of designing structures. Quiz ---- *Cancelled.* Lab --- Writeup: Exercise: 6 Debrief ------- Good preconditions for `(largest-in-list lst)`. * The parameter must be a list * The list must be nonempty * All elements of the list must be real numbers Good postconditions for `(largest-in-list lst)`, assuming we call the result `maximillian`. * `maximillian` is equal to some element of the list * `maximillian` is greater than or equal to all elements of the list * If all the elements of the list are exact, `maximillian` is exact. * If any elements of the list are inexact, `maximillian` is inexact. Note: All of exercise 3 is about coming up with an appropriate procedure that you then use with one of the "list combining" procedures. To combine with a space ```drracket (define combine-with-space (lambda (str1 str2) (string-append str1 " " str2))) ; or (define combine-with-space (section string-append <> " " <>)) ``` To duplicate a string ```drracket (define duplicate-string (lambda (str) (string-append str str))) ; or (define duplicate-string (lambda (str) (regexp-replace* #px"(.*)" str "\\1\\1"))) ; or (define duplicate-string (section regexp-replace* #px"(.*)" <> "\\1\\1")) ``` To compare two strings for length ```drracket (define shorter (lambda (str1 str2) (< (string-length str1) (string-length str2)))) ```