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Aggregate / summarize multiple variables per group (e.g. sum, mean)
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How do you rotate a two dimensional array?
...re it is in C#
int[,] array = new int[4,4] {
{ 1,2,3,4 },
{ 5,6,7,8 },
{ 9,0,1,2 },
{ 3,4,5,6 }
};
int[,] rotated = RotateMatrix(array, 4);
static int[,] RotateMatrix(int[,] matrix, int n) {
int[,] ret = new int[n, n];
for (int i = 0; i < n; ++i) {
for (int j =...
How to produce a range with step n in bash? (generate a sequence of numbers with increments)
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edited Feb 18 '15 at 18:36
Rob Bednark
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What's the magic of “-” (a dash) in command-line parameters?
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edited Nov 8 '11 at 3:15
answered Nov 8 '11 at 3:09
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UTF-8: General? Bin? Unicode?
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In general, utf8_general_ci is faster than utf8_unicode_ci, but less correct.
Here is the difference:
For any Unicode character set, operations performed using the _general_ci collation are faster than those for the _unicode_ci collati...
Force point (“.”) as decimal separator in java
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edited Jun 17 '16 at 8:16
answered Mar 8 '11 at 17:32
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How does Duff's device work?
...int count; // Set to 20
{
int n = (count + 7) / 8; // n is now 3. (The "while" is going
// to be run three times.)
switch (count % 8) { // The remainder is 4 (20 modulo 8) so
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Apache Spark: map vs mapPartitions?
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Alberto Bonsanto
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answered Jan 17 '14 at 19:46
Alexey RomanovAlexey ...
How can I delete one element from an array by value
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I think I've figured it out:
a = [3, 2, 4, 6, 3, 8]
a.delete(3)
#=> 3
a
#=> [2, 4, 6, 8]
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in_array multiple values
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Mark ElliotMark Elliot
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