CSC151.01 2006S, Class 50: Multivariate Data Visualization (1)

Admin:
* Yesterday: 4:00 p.m. talk, 5:00 p.m. meeting, 6:00 p.m. department
  dinner, 7:30 pm. building meeting, home at 10:00 p.m.
* Today: 8:30 a.m. meeting at Glove Factor, 10:00 meeting, 11:00 class,
  12:00 meeting, 12:30 meeting.
* So ... not many email questions answered.
* I'll answer more exam questions in class today.

Overview:
* Short introduction to data visualization.
* Lab.

/Exam Questions/

* How do we deal with random students in problem 1?
> (define students (list (random-student) (random-student) (random-student)))
> students
(#<procedure> #<procedure> #<procedure>)
> (map (lambda (student) (student ':get-last-name)) students)
("Smith" "Jones" "Smith")
> (sorted? students (lambda (student1 student2) ... (student1 ':get-last-name) (student2 ':get-last-name)))

/Data Visuailzation/

* Pictures help us understand information
* Problem: More complex information

As programmers, how would we draw a diagram for the data

2000 19000
2001 20000
2002 22000
2003 25000
2004 35000

* Read the data from a file
* Create an image in the GIMP
* Mentally, think about mapping the first value to x coord and
  the second value to the y coordinte
* Set up coordinate system
  * Draw it
  * Think about the range of x's and y's
* Convert values from new coordinate system to the GIMP's coord
  system
* For each line of the data
  convert to GIMP coordinate system
  draw something