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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
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sqrtss gives a correctly rounded result. rsqrtss gives an approximation to the reciprocal, accurate to about 11 bits.
sqrtss is generating a far more accurate result, for when accuracy is required. rsqrtss exists for the cases when an approximation suffices, but speed is required. If ...
What's the fastest way to convert String to Number in JavaScript?
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There are 4 ways to do it as far as I know.
Number(x);
parseInt(x, 10);
parseFloat(x);
+x;
By this quick test I made, it actually depends on browsers.
http://jsperf.com/best-of-string-to-number-conversion/2
Implicit marked the fastest on 3 browsers, but it makes the code ...
Favicons - Best practices
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Favicon is way more complex than what it sounds. 10 years ago, favicon.ico was the only needed item. Then, there was the touch icon, then multiple touch icons dues to the various iOS devices screen resolutions, then there was the tile icon for Windows...
Javascript reduce on array of objects
Say I want to sum a.x for each element in arr .
15 Answers
15
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How to URL encode a string in Ruby
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str = "\x12\x34\x56\x78\x9a\xbc\xde\xf1\x23\x45\x67\x89\xab\xcd\xef\x12\x34\x56\x78\x9a".force_encoding('ASCII-8BIT')
puts CGI.escape str
=> "%124Vx%9A%BC%DE%F1%23Eg%89%AB%CD%EF%124Vx%9A"
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How do I sort one vector based on values of another
I have a vector x, that I would like to sort based on the order of values in vector y. The two vectors are not of the same length.
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How to prevent XSS with HTML/PHP?
How do I prevent XSS (cross-site scripting) using just HTML and PHP?
9 Answers
9
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if else in a list comprehension [duplicate]
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>>> l = [22, 13, 45, 50, 98, 69, 43, 44, 1]
>>> [x+1 if x >= 45 else x+5 for x in l]
[27, 18, 46, 51, 99, 70, 48, 49, 6]
Do-something if <condition>, else do-something else.
share
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How to round up to the nearest 10 (or 100 or X)?
...ction to plot data. I would like to specify a nice round number for the y-axis max that is greater than the max of the dataset.
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What is the “-->” operator in C++?
...ct two separate operators, -- and >.
The conditional's code decrements x, while returning x's original (not decremented) value, and then compares the original value with 0 using the > operator.
To better understand, the statement could be written as follows:
while( (x--) > 0 )
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