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What are the differences between numpy arrays and matrices? Which one should I use?
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Why are #ifndef and #define used in C++ header files?
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How do I select a random value from an enumeration?
... .OfType<Enum>() // casts to Enum
.OrderBy(e => Guid.NewGuid()) // mess with order of results
.FirstOrDefault(); // take first item in result
}
}
public static class Program
{
public enum SomeEnum
{
One = 1,
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Citing the author of a blockquote using Markdown syntax
...ld like to have the quote followed by a citation beneath it, but right now all it does is blockquote the whole line. How does one do this in markdown syntax?
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Change string color with NSAttributedString?
...sible UIViewController implementation that relies on NSAttributedString in order to update the text and text color of a UILabel from a UISlider:
import UIKit
enum Status: Int {
case veryBad = 0, bad, okay, good, veryGood
var display: (text: String, color: UIColor) {
switch self {
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fastest MD5 Implementation in JavaScript
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"In order to make my JavaScript MD5 code faster than everyone else's, I had to take advantage of local function variables." What a breakthrough!
– Glenn Maynard
Dec 16 '10 at 7:12
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Context switches much slower in new linux kernels
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plain old Unix signals
I had to add
#include <stdint.h>
in order to compile, which I did with this command
g++ -O3 -o condvar-perf condvar-perf.cpp -lpthread -lrt
On kernel 2.6.32
$ ./condvar-perf 1000000
NPTL
mutex elapsed: 29085 us; per iteration: 29 ns / 9...
When is CRC more appropriate to use than MD5/SHA1?
...from network interference, line noise, distortion, etc.
CRC is computationally much less complex than MD5 or SHA1. Using a hash function like MD5 is probably overkill for random error detection. However, using CRC for any kind of security check would be much less secure than a more complex hashing ...
How do you round a float to two decimal places in jruby
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This doesn't work. In order to get it to work you need to account for any size number. Using the pattern implemented here you can: def float_of_2_decimal(float_n) num = float_n.to_s.split('.') num[1] = num[1][0..1] num...
The difference between sys.stdout.write and print?
... buffers the input and might not flush the input to the fd immediately. in order to make sure that it behaves like the print function, you should add: sys.stdout.flush()
– kerbelp
Nov 16 '17 at 7:27
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