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How does the MapReduce sort algorithm work?
... 1 sampled keys that define the key range for each reduce. In particular, all keys such that sample[i − 1] <= key < sample[i] are sent to reduce i. This guarantees that the output of reduce i are all less than the output of reduce i+1."
So their trick is in the way they determine the keys ...
Test whether string is a valid integer
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Additionally, based on character collation (see this related question/answer) something like d[g-i]{2} could end up not only matching dig but also dish in the collation suggested by that answer (where the sh digraph is considered a s...
How to explore web-based Google Play in another country?
if I go to play.google.com, it automatically recognizes my country and allow me to browse the apps for that country. I can change the language through the dropdown in the footer, or I can add &hl=code in the querystring...but that only changes the language...not the store content (the app lists and ...
PHP validation/regex for URL
...hings that jump out at me: use of alternation where character classes are called for (every alternative matches exactly one character); and the replacement shouldn't have needed the outer double-quotes (they were only needed because of the pointless /e modifier on the regex).
–...
Find difference between timestamps in seconds in PostgreSQL
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Try:
SELECT EXTRACT(EPOCH FROM (timestamp_B - timestamp_A))
FROM TableA
Details here: EXTRACT.
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Proper use cases for Android UserManager.isUserAGoat()?
...changed in API 21.
/**
* Used to determine whether the user making this call is subject to
* teleportations.
* @return whether the user making this call is a goat
*/
public boolean isUserAGoat() {
return false;
}
It looks like the method has no real use for us as developers. Someone has ...
Was PreferenceFragment intentionally excluded from the compatibility package?
...cated methods are deprecated as of Android 3.0. They are perfectly fine on all versions of Android, but the direction is to use PreferenceFragment on Android 3.0 and higher.
Can anyone tell me whether this was intentional?
My guess is it's a question of engineering time, but that's just a gue...
Append a Lists Contents to another List C#
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Here is my example:
private List<int> m_machinePorts = new List<int>();
public List<int> machinePorts
{
get { return m_machinePorts; }
}
Init()
{
// Custom function to get available ethernet ports
List<i...
How to get jQuery dropdown value onchange event
...nswered Nov 12 '13 at 7:00
power_scriptorpower_scriptor
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Pandas: drop a level from a multi-level column index?
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@yoonghm It is there, you are probably just calling it on columns that don't have a multi-index
– matt harrison
Dec 18 '18 at 14:59
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