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Fastest check if row exists in PostgreSQL
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if bunch contains 100 rows it will return me 100 rows, you think thats good?
– Valentin Kuzub
Sep 19 '11 at 13:39
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Get mouse wheel events in jQuery?
...t your updated version doesn`t work if the document fits the view ("width: 100vh; height: 100vh") or got "overflow: hidden;". "window.addEventListener('scroll', callback)" is not the correct answer to "window.addEventListener('mousewheel', callback)".
– Daniel
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What are the advantages of NumPy over regular Python lists?
...nto an array:
x = numpy.fromfile(file=open("data"), dtype=float).reshape((100, 100, 100))
Sum along the second dimension:
s = x.sum(axis=1)
Find which cells are above a threshold:
(x > 0.5).nonzero()
Remove every even-indexed slice along the third dimension:
x[:, :, ::2]
Also, many us...
JUnit 4 compare Sets
...ered Mar 19 '12 at 16:48
jayunit100jayunit100
15.9k1919 gold badges8080 silver badges145145 bronze badges
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How does tuple comparison work in Python?
...s. try: x = tuple([0 for _ in range(n)]) and do the same for y. Setting n=100, 1000, 10,000, and 100,000 and running %timeit x==y gave timing values of .5, 4.6, 43.9, and 443 microseconds respectively, which is about as close to O(n) as you can practically get.
– Michael Scot...
Node.js Unit Testing [closed]
... answered Oct 17 '13 at 6:01
sam100ravsam100rav
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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://jakevd...
python max function using 'key' and lambda expression
... to compare those items by their integer value.
>>> lis = ['1', '100', '111', '2']
Here max compares the items using their original values (strings are compared lexicographically so you'd get '2' as output) :
>>> max(lis)
'2'
To compare the items by their integer value use ke...
Hidden Features of Visual Studio (2005-2010)?
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Function to convert column number to letter?
...lse), "$")
Col_Letter = vArr(0)
End Function
testing code for column 100
Sub Test()
MsgBox Col_Letter(100)
End Sub
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