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Histogram Matplotlib
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import matplotlib.pyplot as plt
import numpy as np
mu, sigma = 100, 15
x = mu + sigma * np.random.randn(10000)
hist, bins = np.histogram(x, bins=50)
width = 0.7 * (bins[1] - bins[0])
center = (bins[:-1] + bins[1:]) / 2
plt.bar(center, hist, align='center', width=width)
plt.sh...
Store query result in a variable using in PL/pgSQL
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Create Directory if it doesn't exist with Ruby
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Is there any difference between the `:key => “value”` and `key: “value”` hash notations?
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Random Gaussian Variables
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Jarrett's suggestion of using a Box-Muller transform is good for a quick-and-dirty solution. A simple implementation:
Random rand = new Random(); //reuse this if you are generating many
double u1 = 1.0-rand.NextDouble(); //uniform(0,1] random doubles
double u...
get all keys set in memcached
... answered Oct 24 '13 at 9:34
mu 無mu 無
55.9k2727 gold badges124124 silver badges156156 bronze badges
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Are Javascript arrays sparse?
... edited May 23 '17 at 11:54
Community♦
111 silver badge
answered Oct 2 '09 at 17:21
ChristophChristoph
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sqlite alter table add MULTIPLE columns in a single statement
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Detail change after Git pull
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How to change column datatype from character to numeric in PostgreSQL 8.4
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