VS265: Homework assignments Fall2012

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Students are encouraged to work in groups, but turn in assignments individually, listing the group members they worked with.

Submission instructions: email both a PDF of your solutions as well as your code (.m or .py files) as attachments to:

   rctn.org vs265 (vs265 should be out front)

You can hand in a paper copy of your solutions before class, but you still have to email your code to the address above before the assignment is due.



Amir, the past GSI for the course says "There is a guide to Matlab on the web by Kevin Murphy which is really excellent. I think it would be great for the VS265 students: http://code.google.com/p/yagtom/"


Fernando Perez at the Brain Imaging Center has an excellent set of resources on Python for scientific computing. You will likely find the "Starter Kit" particularly useful.


Lab #1, due Wednesday, September 5th at beginning of class

Lab #2, due Wednesday, September 19th at beginning of class

for Python: either ...

  In [1]: import scipy.io
  In [2]: d = scipy.io.loadmat("data.mat")
  In [3]: X,O = d['X'],d['O']

or use data.npz

  In [1]: import numpy as np
  In [2]: d = np.load('data.npz')
  In [3]: X,O = d['X'],d['O']

Lab #3, due Wednesday, Sept. 26 at beginning of class

For Python you can use apples-oranges.npz

  In [1]: import numpy as np
  In [2]: d = np.load('apples-oranges.npz')
  In [3]: d.keys()
  Out[3]: ['oranges2', 'apples2', 'apples', 'oranges']

Lab #4, due Thursday, October 4 at 9:00

Matlab code are as separate files below.

For Python you can use

  • Solutions.pdf This is a solution from a previous version of this class that is really well written.

Lab #5, due Monday, Oct 15 at beginning of class

Lab #6, due Wednesday, Oct 24 at beginning of class

Python code:


Lab #7, due Wednesday, Oct 31 at beginning of class

Python code:

  • hopnet.py - python version of the above code as one file (with run, genpat, and corrupt methods)
  • patterns.npz
   p = np.load('patterns.npz')
   face,hi,X = p['face'], p['hi'], p['X']
   # if you load patterns.mat, use:
   p = scipy.io.loadmat("patterns.mat")
   face,hi,X = [p[k].reshape(10,10).T.reshape(100,1) for k in 'face','hi','X']
   # line above converts Fortran to C ordering
  • Solutions: The outer product rule to calculate V is given by X*X' + face*face' + hi*hi'; *

Writeup Scripts

Lab #8, due Wednesday, Nov. 14 at beginning of class

Lab #9 (optional), due Monday, Nov. 26 at beginning of class

Python code:

Lab #10 (optional), due Monday, Dec. 3 at beginning of class

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