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I am trying to run the code presented on the second page:

http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00-introduction-to-computer-science-and-programming-fall-2008/video-lectures/lecture-20/lec20.pdf

At the bottom of the code you have to add these lines:

simFlips(100,100)

show()

Here is the error that I get when I run it on ubuntu:

Traceback (most recent call last):
  File "coin.py", line 36, in <module>
    simFlips(100,100)
  File "coin.py", line 16, in simFlips
    diffs.append(abs(heads - tails))
AttributeError: 'numpy.ndarray' object has no attribute 'append'

Please tell me what I'm doing wrong that gives me the last error. Thanks in advance!

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1  
For some reason your diffs variable is a numpy ndarray. Are you sure you left the line that says diffs = []? This sets diffs to be an empty python list, which you can call append on. –  jozzas Dec 7 '11 at 2:06
    
Works for me as written. –  DSM Dec 7 '11 at 2:09
    
Yes I did, I just took the code from the pdf added the two lines at the bottom and started to get this error. –  vahshi Dec 7 '11 at 2:20
    
DSM, how did you execute the code. On ubuntu or a different platform? –  vahshi Dec 7 '11 at 2:21

1 Answer 1

up vote 1 down vote

Use numpy.concatenate(list1 , list2) or numpy.append() Look into the thread at append a numpy array to a numpy array.

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