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To: python-list@python.org
From: Lie Ryan <lie.1296@gmail.com>
Subject: Re: Plot seems weird
Date: Tue, 27 Dec 2011 21:54:57 +1100
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On 12/27/2011 06:14 AM, Yigit Turgut wrote:
> On Dec 26, 8:58 pm, Lie Ryan<lie.1...@gmail.com>  wrote:
>> On 12/27/2011 04:08 AM, Yigit Turgut wrote:
>>
>> not your fault, I made a mistake when copy-pasteing the code, here's the
>> fixed code:
>>
>> from itertools import izip_longest
>> def to_square(data):
>>        sq_data = [[], []]
>>        for x,y, xn in izip_longest(data[0], data[1], data[0][1:]):
>>            sq_data[0].append(x)
>>            sq_data[1].append(y)
>>            sq_data[0].append(xn)
>>            sq_data[1].append(y)
>>        return numpy.array(sq_data, dtype=float)
>>
>> use it like this:
>>
>> t,y1 = to_square(numpy.genfromtxt(filename, unpack=True))
>> pyplot.plot(t,y1)
>> pyplot.show()
>
> Significant improvement on the plot, pretty interesting. It runs ok
> but I need to know how?! (:

it's pretty simple, actually; just observe the numbers before and after 
it's fixed by the function and it should be fairly obvious.