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What is the significance of initializing direction arrays below with given values when developing ch
... index of the arrays will make from the central point, X, at 2,2.)
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.536.
.1X0.
.724.
.....
The way it is set up, if you do ^1 (^ being bitwise XOR) on the index you get the opposite direction - 0 and 1 are opposites, 2 and 3 are opposites and so on. (Another way to set it up is to go clockw...
How to compare two strings in dot separated version format in Bash?
Is there any way to compare such strings on bash, e.g.: 2.4.5 and 2.8 and 2.4.5.1 ?
29 Answers
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Reverse Range in Swift
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185
Update For latest Swift 3 (still works in Swift 4)
You can use the reversed() method on a range...
C char array initialization
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225
This is not how you initialize an array, but for:
The first declaration:
char buf[10] = "";
...
Replace all 0 values to NA
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252
Replacing all zeroes to NA:
df[df == 0] <- NA
Explanation
1. It is not NULL what you s...
How can I obtain the element-wise logical NOT of a pandas Series?
...st of 3: 91.8 µs per loop
In [11]: %timeit ~s
10000 loops, best of 3: 73.5 µs per loop
In [12]: %timeit (-s)
10000 loops, best of 3: 73.5 µs per loop
As of Pandas 0.13.0, Series are no longer subclasses of numpy.ndarray; they are now subclasses of pd.NDFrame. This might have something to do w...
Convert column classes in data.table
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105
For a single column:
dtnew <- dt[, Quarter:=as.character(Quarter)]
str(dtnew)
Classes ‘da...
Expand a random range from 1–5 to 1–7
Given a function which produces a random integer in the range 1 to 5, write a function which produces a random integer in the range 1 to 7.
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Fastest hash for non-cryptographic uses?
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58
CRC32 is pretty fast and there's a function for it: http://www.php.net/manual/en/function.crc32...
How to initialize an array's length in JavaScript?
... just store the length in some variable, e.g.
var data = [];
var length = 5; // user defined length
for(var i = 0; i < length; i++) {
data.push(createSomeObject());
}
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