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Sample random rows in dataframe
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First make some data:
> df = data.frame(matrix(rnorm(20), nrow=10))
> df
X1 X2
1 0.7091409 -1.4061361
2 -1.1334614 -0.1973846
3 2.3343391 -0.4385071
4 -0.9040278 -0.6593677
5 0.4180331 -1.2592415
6 0.7572246 -0.5463655
7 -0.8996483 0.4231117
8 ...
Is there a way to squash a number of commits non-interactively?
... message"
– KingCrunch
Sep 1 '11 at 20:16
7
@Phillip: You can embed a shell function in the git a...
Integer division with remainder in JavaScript?
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Another one, whose purpose I just spent the last 20 minutes trying to figure out, is apparently a/b | 0
– BlueRaja - Danny Pflughoeft
Mar 25 '11 at 22:42
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Convert data.frame column to a vector?
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answered Aug 15 '11 at 20:19
joranjoran
152k2525 gold badges379379 silver badges431431 bronze badges
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Adding a legend to PyPlot in Matplotlib in the simplest manner possible
...):
import numpy as np
import matplotlib.pyplot as plt
x = np.linspace(0, 20, 1000)
y1 = np.sin(x)
y2 = np.cos(x)
plt.plot(x, y1, "-b", label="sine")
plt.plot(x, y2, "-r", label="cosine")
plt.legend(loc="upper left")
plt.ylim(-1.5, 2.0)
plt.show()
Slightly modified from this tutorial: http://ja...
Applying function with multiple arguments to create a new pandas column
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>>> import numpy as np
>>> df = pd.DataFrame({"A": [10,20,30], "B": [20, 30, 10]})
>>> df['new_column'] = np.multiply(df['A'], df['B'])
>>> df
A B new_column
0 10 20 200
1 20 30 600
2 30 10 300
or vectorize arbitrary functi...
Are foreign keys really necessary in a database design?
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answered Aug 20 '08 at 20:19
John TopleyJohn Topley
104k4343 gold badges186186 silver badges234234 bronze badges
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With bash, how can I pipe standard error into another process?
...nd log back in.
– Rolf
Mar 1 '18 at 20:47
1
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How to install therubyracer gem on 10.10 Yosemite?
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answered Jul 30 '14 at 20:01
mmlnmmln
2,00433 gold badges2121 silver badges3030 bronze badges
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How to generate random SHA1 hash to use as ID in node.js?
...ost insane parallel computing situations. I know its silly and randomBytes(20) is going to be unique, but its just a confidence we can have because we may not be familiar with internals of random generation of another library.
– Dmitri R117
Sep 5 '17 at 15:13
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