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Why do we check up to the square root of a prime number to determine if it is prime?
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edited May 26 at 19:28
answered Apr 27 '11 at 22:04
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How to get the sizes of the tables of a MySQL database?
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2016
You can use this query to show the size of a table (although you need to substitute the varia...
C# namespace alias - what's the point?
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152
That is a type alias, not a namespace alias; it is useful to disambiguate - for example, against...
How to do a logical OR operation in shell scripting
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edited Apr 26 '18 at 10:40
JohannesM
21122 silver badges1212 bronze badges
answered Nov 6...
Changing the selected option of an HTML Select element
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329
Vanilla JavaScript
Using plain old JavaScript:
var val = "Fish";
var sel = document.getE...
nodejs how to read keystrokes from stdin
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62
You can achieve it this way, if you switch to raw mode:
var stdin = process.openStdin();
requir...
What is the best way to get all the divisors of a number?
...ewgill
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Creating an empty Pandas DataFrame, then filling it?
..., index=index, columns=columns)
In [11]: df
Out[11]:
A B C
2012-11-29 0 0 0
2012-11-30 1 1 1
2012-12-01 2 2 2
2012-12-02 3 3 3
2012-12-03 4 4 4
2012-12-04 5 5 5
2012-12-05 6 6 6
2012-12-06 7 7 7
2012-12-07 8 8 8
2012-12-08 9 9 9
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Parse query string into an array
...ut in an array instead of into individual variables.
$get_string = "pg_id=2&parent_id=2&document&video";
parse_str($get_string, $get_array);
print_r($get_array);
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improve this...
Sleep until a specific time/date
...do the following:
current_epoch=$(date +%s)
target_epoch=$(date -d '01/01/2010 12:00' +%s)
sleep_seconds=$(( $target_epoch - $current_epoch ))
sleep $sleep_seconds
To add precision down to nanoseconds (effectively more around milliseconds) use e.g. this syntax:
current_epoch=$(date +%s.%N)
tar...