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使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
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使用虚拟现实和App Inventor进行实...
How to convert a PNG image to a SVG? [closed]
...nm # PNG to PNM
potrace file.pnm -s -o file.svg # PNM to SVG
Explain options
potrace -s => Output file is SVG
potrace -o file.svg => Write output to file.svg
Example
Input file = 2017.png
convert 2017.png 2017.pnm
Temporary file = 2017.pnm
potrace 2017.pnm -s -o 2017.svg
...
How to capitalize the first letter in a String in Ruby
...want it to, it outputs мария instead of Мария.
If you're using Rails there's an easy workaround:
"мария".mb_chars.capitalize.to_s # requires ActiveSupport::Multibyte
Otherwise, you'll have to install the unicode gem and use it like this:
require 'unicode'
Unicode::capitalize("м...
Detecting iOS / Android Operating system
...dow.opera;
// Windows Phone must come first because its UA also contains "Android"
if (/windows phone/i.test(userAgent)) {
return "Windows Phone";
}
if (/android/i.test(userAgent)) {
return "Android";
}
// iOS detection from: http://stackoverflow.com/a/90...
Detect iPad users using jQuery?
...ption is incorrect as iOS apps can and do customize their user agent. The main offender here is Facebook.
Compare these user agent strings from iOS devices:
# iOS Safari
iPad: Mozilla/5.0 (iPad; CPU OS 5_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B176 Safari/7534.4...
现实版《道士下山》：道长老梁的四面人生 - 轻松一刻 - 清泛网 - 专注C/C++...
...
有时候，他会给城市里的徒弟发去一张野果的照片。吃不上的徒弟很是羡慕。一分钟后，他告诉徒弟，“果子已经被为师超度了”，发过去一张果核的照片。
有时，徒弟们抽空上山来探望师傅。老梁早早爬到山上，把刚熟的...
How can I concatenate two arrays in Java?
...files where some of the facilities like those mentioned by Antti are not available.
– kvn
Feb 7 '11 at 15:46
4
...
How to find the kth largest element in an unsorted array of length n in O(n)?
... i)
If i > k, return Select(G, n-k, i-k)
It's also very nicely detailed in the Introduction to Algorithms book by Cormen et al.
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Multiprocessing: How to use Pool.map on a function defined in a class?
...or p in proc]
return [p.recv() for (p, c) in pipe]
if __name__ == '__main__':
print parmap(lambda x: x**x, range(1, 5))
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Defeating a Poker Bot
...
classify rogue cheating or robotic
players.
Back when online poker was a fairly
new entity, there was rumour and talk with limited evidence that
some poker client software
screen-shots of suspicious players
desktops to see if they were running
programs that assist them. However (even if this were ...