nov 29
I've put more here that we can do today.
We'll pick and choose and/or continue Thursday.
1. Final project questions? Presentations one week from today; due a week from Friday. Discuss status.
Project rubrik:
- idea / difficulty / planning
- mastery of course material
- follow through / finished & runs without error
- docs / tests / sample output / easy to see how it works
2. Course evaluations.
3. Python examples :
3a. scientific python : discuss numpy, matplotlib, etc; look at some examples.
Fast manipulations of big collections of numbers,
including plots, transforms, programming.
Similar tools: MatLab, IDL, GDL
Numpy has several classes for collections of numbers:
- arrays (element by element operations)
- matricies (matrix
$ python
>>> from pylab import * # all matplotlib.pyplot & numpy names
# plot of sin(x)/x
>>> dx = 0.01
>>> x = arange(dx, 4*pi, dx) # array range
>>> y = sin(x)/x # element by element
>>> plot(x, y)
# statistics
>>> mean(y)
0.11840453572377389
>>> std(y) # standard deviation
0.3278530674534389
# manipulating an array
>>> x.ndim
1
>>> x.shape
(1256,)
>>> x[3:4]
array([ 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1 ])
# a histogram
>>> x = randn(10000)
>>> hist(x, 100)
# matrix work
# *** note that numpy's, nm[i,j] is python's m[i][j]
>>> m = matrix([[1,2,3], [1,0,1], [0,2,-1]])
>>> m
matrix([[1, 2, 3],
[1, 0, 1],
[0, 2, -1]])
>>> m[0,:]
matrix([[1, 2, 3]])
>>> m[: , 0] # remember that a[:] is all elements
matrix([[1],
[1],
[0]])
>>> m * m # matrix multiplication
matrix([[ 3, 8, 2],
[ 1, 4, 2],
[ 2, -2, 3]])
>>> m[0:2, 0:2]
matrix([[1, 2],
[1, 0]])
>>> inv(m)
matrix([[-0.33333333, 1.33333333, 0.33333333],
[ 0.16666667, -0.16666667, 0.33333333],
[ 0.33333333, -0.33333333, -0.33333333]])
>>>
3b. Tron robots from last year's programming workshop
Browse through a bit of the code:
Run an example from notes on my laptop at
/Users/mahoney/academics/term/2010-01-spring/programming_workshop/tron/
3c. a program from a previous student's plan: traveling salesman
4. Review: walk through everything we've done this semester.
![[paper clip]](/courses/source/wiki_images/paper_clip_tilt.png)
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