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answered Aug 3 '12 at 3:09
MuhdMuhd
19.1k2020 gold badges5858 silver badges7272 bronze badges
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Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
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I would suggest using the duplicated method on the Pandas Index itself:
df3 = df3[~df3.index.duplicated(keep='first')]
While all the other methods work, the currently accepted answer is by far the least performant for the provided example. Furthermore, while the groupby method is only slightly les...
Python Infinity - Any caveats?
...*2
4.0
>>> _**2
16.0
>>> _**2
256.0
>>> _**2
65536.0
>>> _**2
4294967296.0
>>> _**2
1.8446744073709552e+19
>>> _**2
3.4028236692093846e+38
>>> _**2
1.157920892373162e+77
>>> _**2
1.3407807929942597e+154
>>> _**2
Traceba...
How to get different colored lines for different plots in a single figure?
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432
Matplotlib does this by default.
E.g.:
import matplotlib.pyplot as plt
import numpy as np
x ...
python plot normal distribution
...math
mu = 0
variance = 1
sigma = math.sqrt(variance)
x = np.linspace(mu - 3*sigma, mu + 3*sigma, 100)
plt.plot(x, stats.norm.pdf(x, mu, sigma))
plt.show()
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how to break the _.each function in underscore.js
...s, you could do something convoluted like this (link to JSFiddle):
[1, 2, 3, 4].every(function(n) {
alert(n);
return n !== 3;
});
This will alert 1 through 3, and then "break" out of the loop.
You're using underscore.js, so you'll be pleased to learn that it does provide an every method...
App Inventor 2开发计步器与定位器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...2.了解数据持久化，掌握数据存储等功能的实现；
3.通过编程实践，感受和体验利用手机自身硬件开发实用的手机应用程序。 【项目范例】
1. 情境
现在的手机都已经具有计步器及位置传感器等各种硬件传感...
Backporting Python 3 open(encoding=“utf-8”) to Python 2
I have a Python codebase, built for Python 3, which uses Python 3 style open() with encoding parameter:
6 Answers
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range() for floats
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answered Sep 1 '11 at 7:36
kichikkichik
26.2k22 gold badges7575 silver badges9292 bronze badges
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ROW_NUMBER() in MySQL
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I want the row with the single highest col3 for each (col1, col2) pair.
That's a groupwise maximum, one of the most commonly-asked SQL questions (since it seems like it should be easy, but actually it kind of isn't).
I often plump for a null-self-join:
SELECT t0....