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How do you get the magnitude of a vector in Numpy?
...or loops. For example:
In [1]: import numpy as np
In [2]: a = np.arange(1200.0).reshape((-1,3))
In [3]: %timeit [np.linalg.norm(x) for x in a]
100 loops, best of 3: 4.23 ms per loop
In [4]: %timeit np.sqrt((a*a).sum(axis=1))
100000 loops, best of 3: 18.9 us per loop
In [5]: np.allclose([np.lina...
Resizing SVG in html?
...ent values. Good luck.
Set a fixed aspect ratio with preserveAspectRatio="X200Y200 meet (e.g. 200px), but it's not necessary
e.g.
<svg
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:cc="http://creativecommons.org/ns#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xml...
Match whitespace but not newlines
...SPACE
U+00A0 NO-BREAK SPACE (not matched by \s)
U+1680 OGHAM SPACE MARK
U+2000 EN QUAD
U+2001 EM QUAD
U+2002 EN SPACE
U+2003 EM SPACE
U+2004 THREE-PER-EM SPACE
U+2005 FOUR-PER-EM SPACE
U+2006 SIX-PER-EM SPACE
U+2007 FIGURE SPACE
U+2008 PUNCTUATION SPACE
U+2009 THIN SPACE
U+200A HAIR SPACE
U+202F NA...
Is there an equivalent to background-size: cover and contain for image elements?
...ection-2014-day-4-5483168891142144-hp.jpg"
/>
<!-- 366x200 -->
</div>
<h1>cover</h1>
<div class="container cover">
<img
src="https://www.google.de/logos/doodles/2014/european-parliament-election-2014-day-4-5483168891142144-hp.j...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 - App Invent...
...弄错以免烧坏硬件）一般来说，需要接线的端口有以下4个，无论哪款蓝牙硬件，也无论哪种其他硬件，这4个端口都是基本的存在：VCC（正极）、GND（接地负极）、TX、RX 交叉接线，参考接线如图：2、串口工具测试接线完成后，...
How to Truncate a string in PHP to the word closest to a certain number of characters?
...short sentence or two; but for this widget I can't display more than, say, 200 characters. I could use substr() to chop off the text at 200 chars, but the result would be cutting off in the middle of words-- what I really want is to chop the text at the end of the last word before 200 chars.
...
What does “Memory allocated at compile time” really mean?
In programming languages like C and C++, people often refer to static and dynamic memory allocation. I understand the concept but the phrase "All memory was allocated (reserved) during compile time" always confuses me.
...
How to select unique records by SQL
... */
INSERT INTO dupes(word, num, id)
VALUES ('aaa', 100, 1)
,('bbb', 200, 2)
,('ccc', 300, 3)
,('bbb', 400, 4)
,('bbb', 200, 5) -- duplicate
,('ccc', 300, 6) -- duplicate
,('ddd', 400, 7)
,('bbb', 400, 8) -- duplicate
,('aaa', 100, 9) -...
Why is a boolean 1 byte and not 1 bit of size?
In C++,
12 Answers
12
...
Extracting text OpenCV
...se note that I'm using a scaled down version of the image for processing.
c++ version
The MIT License (MIT)
Copyright (c) 2014 Dhanushka Dangampola
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), t...