---
title: Eboard 15  Displaying data
number: 15
section: eboards
held: 2017-09-27
---
CSC 151.03, Class 15:  Displaying data
======================================

_Overview_

* Preliminaries
    * Notes and news
    * Upcoming work
    * Extra credit
    * Questions
* Lab
* Debrief (?)

### News / Etc.

* New partners.  Today's partners are your homework partners.
* Please make sure to return your computer cards to the jar.
* A number of you had questions for me Monday afternoon and Tuesday that
  were also clearly questions on Monday morning.  *Please* ask those 
  questions in class.  You were not alone in having issues.
* When you send me email about homework assignments, please carbon-copy 
  your partner.
* I am discontinuing the flash card assignments.  I have not had time
  to check them over.  Those who have done them for the first four
  weeks will receive a modicum of extra credit.
* <http://pioneers.grinnell.edu/news/2017/9/24/pioneer-womens-soccer-team-finishes-perfect-weekend-with-win-over-lake-forest.aspx>
* Quiz topics
    * Conditionals
    * Displaying data
    * Documentation, revisited

### Upcoming Work

* [Writeup for class 15](../writeups/writeup15) due Friday at 10:30 p.m.
    * Exercise 5
    * To: <csc151-03-grader@grinnell.edu>
    * Subject: CSC 151.03 Writeup 15 (YOUR NAMES)
* [Assignment 5](../assignments/assignment05) due Tuesday at 10:30 p.m.
    * Not yet available.
* Reading for Friday's class: [Preconditions](../readings/preconditions)

### Extra credit (Academic/Artistic)

* Convocation, Thursday: Wilson Okello on "Living in the Wake of Crisis"
* CS Table, Tuesday: Tapia.
* CS Extras, Thursday week: ???
* Google on Tech interviews today at 4:00 p.m. in 3821.

### Extra credit (Peer)

* Women's soccer at 4:30 p.m.

### Extra Credit (Misc)

_None at the moment._

### Other Good Things

* GHS Homecoming - Downtown on Thursday at 4pmish.
* Volleyball at 7:00 p.m.

### Questions

What happens to the five percent of our grade that was previously allocated to flash cards?
  : It will move elsewhere.

What should I do when Firefox stops working?
  : Option 1: Open a terminal window.  Type `stop-firefox`. Enter your
    password when prompted.
  : Option 2: Open a terminal window.  Type `/home/rebelsky/bin/magic-incantation`.  Cross your fingers.
  : Option 3: Ask me to explain the details.

Wow!   It's so awesome that linux is designed so that you can make your programs available to other people!!
  : I agree.

Do we have to meet with you if we get an extension?
  : It's a good idea.

Lab
---

What symbols are available?

```
      'dot               'point            'pixel
      'plus              'times            'asterisk
      '5asterisk         'odot             'oplus
      'otimes            'oasterisk        'o5asterisk
      'circle            'square           'diamond
      'triangle          'fullcircle       'fullsquare
      'fulldiamond       'fulltriangle     'triangleup
      'triangledown      'triangleleft     'triangleright
      'fulltriangleup    'fulltriangledown 'fulltriangleleft
      'fulltriangleright 'rightarrow       'leftarrow
      'uparrow           'downarrow        '4star
      '5star             '6star            '7star
      '8star             'full4star        'full5star
      'full6star         'full7star        'full8star
      'circle1           'circle2          'circle3
      'circle4           'circle5          'circle6
      'circle7           'circle8          'bullet
      'fullcircle1       'fullcircle2      'fullcircle3
      'fullcircle4       'fullcircle5      'fullcircle6
      'fullcircle7       'fullcircle8)
```

Debrief
-------

```
(define ll
  (lambda (entry)
    (list (cadr entry)
          (caddr entry))))

(define pt
  (lambda (entry)
    (list (caddr entry) (cadr entry))))

; (plot (points (map ll (filter useful-entry? zips))))

; (plot (points (map pt (filter useful-entry? zips))))

;(plot (points (map pt (filter useful-entry? zips))
;              #:x-min -150
;              #:x-max -50))
;(plot (list
;       (points (map pt (filter useful-entry? zips))
;               #:x-min -150
;               #:x-max 0)
;       (points (map pt (filter useful-entry? zips3))
;               #:sym 'fullcircle6
;               #:fill-color "red")))
```